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From the book — Chapter 1. A percent is just a fraction with 100 on the bottom. 15% of 80 is 0.15 × 80 = 12. To find what one number is of another, divide and multiply by 100. For a change, take the difference over the original — an increase from 120 to 150 is 30 ÷ 120 = 25% up.
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