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Q&A for How to Subtract Percentages in Math

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100 - 10% = 90, but 90 + 10% = 99. How is this possible?

Community Answer

If you take 90 and divide by 10, you get 9. Therefore, ten percent of 90 plus 90 is equal to 90 + 9, which equals 99.

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A company manufactured 6,435 bars of soap. If it sold 20% of its bars of soap, how many bars of soap did it sell?

Donagan

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Multiply the total number of bars by 0.2, or you could divide the total bars by 5.

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How do I calculate 20% of $79?

Donagan

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Multiply $79 by 0.20.

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I bought a jacket. The price was originally $700. The discount was 30% off. What is the price of the jacket?

Community Answer

$700(100% - 30%) = ($700)(70%) = $700(.7) = $490.

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