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Think of it the other way around.

5 times 15% = 0.75

6 times 15% = 0.90

You've added 0.15 because you've multiplied it one more time.

0.15 = 15%

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Q: Why is 15 percent of 5 equals 0.75 and 15 percent of 6 equals 0.9 Why does it add 0.15?
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