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Question

How do you easily add the tip to a bill at a restaurant?

David Jia
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David Jia is an Academic Tutor and the Founder of LA Math Tutoring, a private tutoring company based in Los Angeles, California. With over 10 years of teaching experience, David works with students of all ages and grades in various subjects, as well as college admissions counseling and test preparation for the SAT, ACT, ISEE, and more. After attaining a perfect 800 math score and a 690 English score on the SAT, David was awarded the Dickinson Scholarship from the University of Miami, where he graduated with a Bachelor’s degree in Business Administration. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math.

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Expert Answer

You can easily calculate your total bill including a tip or a tax by adding 1 to the percentage. For example, if you have a $20 meal and you want to add 15% to the bill, multiply $20 by 1.15 to get $23. That's faster than figuring out 15% of $20, which is $3, then adding it back to $20.

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Question

How do you take a percent of a number that isn't 100?

David Jia
Math Tutor
David Jia is an Academic Tutor and the Founder of LA Math Tutoring, a private tutoring company based in Los Angeles, California. With over 10 years of teaching experience, David works with students of all ages and grades in various subjects, as well as college admissions counseling and test preparation for the SAT, ACT, ISEE, and more. After attaining a perfect 800 math score and a 690 English score on the SAT, David was awarded the Dickinson Scholarship from the University of Miami, where he graduated with a Bachelor’s degree in Business Administration. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math.

David Jia

Math Tutor

Expert Answer

If you have a problem like "What's 25% of 50?" turn the percent into a decimal. In this case, 25% is the same as 0.25. Then, you'd multiply that by the second number—0.25 times 50, which is 12.5.

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Question

What is 6% off 299.00?

Donagan

Top Answerer

Multiply 299.00 by 0.06 to get the amount of the discount. Subtract that amount from 299.00 to find the number that replaces 299.00.

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Question

164 selections, 46 winners. What is the percentage?

Donagan

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If you're asking what percentage 46 is of 164, divide 46 by 164, multiply the quotient by 100, and place a percent sign to the right.

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Question

How do I get a percentage when it's 19/29?

Donagan

Top Answerer

Divide 19 by 29, then multiply the quotient by 100, and add the % mark.

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Question

What percentage is 62,000,000 of 163,433,400?

Donagan

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Divide the first number by the second, then multiply by 100 (and add the % mark).

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Question

How do I work out 15% when my mobile phone calculator has no % key?

Donagan

Top Answerer

Multiply by 0.15.

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Question

If I'm getting a pay increase of 2.05%, how do I figure that?

Donagan

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Multiply the original pay amount by 0.0205. That gives you the pay increase. Add that to the original pay amount to find the new pay amount.

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Question

How do I convert a number to a percentage of another number?

Donagan

Top Answerer

To convert 2 to a percentage of 4, for example, first divide 2 by 4. The answer is a decimal. Multiply it by 100, then add the percent sign.

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Question

How do I figure the percentage increase of 282,152 - 277,088 = 5064?

Donagan

Top Answerer

Divide the difference (5,064) by the original number (277,088).

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Question

X is what percent of y?

Donagan

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Multiply (x/y) by 100. That's the equivalent of (100x) divided by y.

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Question

How would I subtract 10% from 754,832?

Donagan

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Multiply 754,832 by 0.1. Subtract that number from 754,832.

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Question

If 12% of a number is 213.50, how do I calculate the number I started with?

Donagan

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Divide 213.50 by 0.12.

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Question

How do I determine a reduction percentage?

Donagan

Top Answerer

Divide the amount of the reduction by the original number. Then multiply by 100 to get a percentage value. For example, if 6 is reduced to 4, the amount of the reduction is 2. Divide 2 by the original number, 6. 2÷6 = 0.33. Multiply by 100 to get 33, and add the percent sign: 33%.

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Question

I am presenty using 1.175 formula divided into the amount to get 17.5% off. Is this apprach correct and what is the difference?

Community Answer

No. Those calculations are not equivalent. Full price discounted 17.5% means 100% - 17.5% = 82.5% = 0.825. DiscountPrice = 0.825*FullPrice. But if you divide 1/1.175 on a calculator, you get 0.851, which is a slightly smaller discount (about 15%). Be sure to read these types of problems carefully to answer "percent of what?" Otherwise it's tempting to make a mistake of assuming a 10% increase undoes a 10% decrease, but 1.1*0.90 = 0.99, not 1.00.

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Question

What percentage is a 486.15 m² dwelling of an 1862 m² section?

Donagan

Top Answerer

To calculate the percentage, you divide the dwelling's area by the total section area. For example, 486.15 m² divided by 1862 m² is approximately 0.261, which equals 26.1%.

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Question

How do I get the percentage of 226 people that 52 people represent?

Donagan

Top Answerer

Divide 52 by 226, then multiply that decimal by 100%. 52 / 226 = 0.23 = 23%.

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Question

If I have 68 units and I need to know what percentage 48 units is of the 68, how do I do that?

Donagan

Top Answerer

Divide 48 by 68. 48 / 68 = 0.7058, then multiply by 100 giving 70.6%.

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Question

How do I reverse a percentage, such as finding what percentage the original size represents if an object grew by 1.14%?

Donagan

Top Answerer

To reverse a percentage, divide 1 by the percentage value expressed as a decimal. For example, if an object grew by 1.14%, you would divide 1 by 1.0114. This calculation (1 / 1.0114 ≈ 0.989) shows that the original size was approximately 98.9% of the new size.

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Question

If I know that 3662 represents 60% of a total, how can I calculate the full 100% figure?

Donagan

Top Answerer

To find the 100% figure, you can divide the given number (3662) by its corresponding percentage (60%) expressed as a decimal (0.6). Therefore, 3662 divided by 0.6 equals 6103.33.

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Question

What formula do I use to calculate 16 2/3% of any given number?

Community Answer

The easiest way to do it is simply to divide the given number by 6, because 16 2/3% is the same as the fraction 1/6. You can also multiply the given number by 0.1667.

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Question

What percentage of students are in quarantine if there are 80 out of 3,111?

I_l1ke_gam3s

Community Answer

To find the percentage, divide 80 by 3,111, multiply the result by 100, and then add the percent sign.

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Question

How do I increase 1,000 by 15%?

Community Answer

Multiply 1,000 by 115% (which is the same as multiplying 1,000 by 15% and then adding that number to 1,000). This can be calculated as (1000)(1.15), which equals 1150 (the number you're looking for).

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Question

What percentage of 19 is 6?

Community Answer

6 / 19 = 0.3158 = 31.58%.

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What percentage of 12,300 is 383?

Community Answer

Using a calculator, divide 383 by 12,300. That's 0.0311. Multiply by 100 to get 3.11%.

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Question

What is 2.57 percent of 2275.00?

Community Answer

If you're using a calculator, enter "2275". Then press "X". Then enter ".0257". You'll get 58.4675.

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Question

How would you use a calculator to find out what is 30% of 50,000?

Community Answer

Enter "50000". Then press "X." Then enter ".3". The display will show "15000". The answer is 15,000.

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Question

How do I work out what percentage have I achieved: 11 out of 30?

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Community Answer

11/30. To do this, divide 11 by 30. You get 0.37 (rounded to two decimal places). Then multiply by 100. The answer is about 37%.

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What is 3.2% of 1661.60?

Community Answer

As a decimal, 3.2% is 0.032. 0.032 x 1661.60 = 53.17.

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What is the percentage of profit if I buy a product at 150€ and sell it for 320€?

Donagan

Top Answerer

Subtract 150 from 320. That's 170. Divide by 150. That's 1.13. Multiply by 100 and add at percent sign. The profit is 113%, diminished by any other costs you might have.

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