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i would calculate this by taking 10% which is 1.5 (that's easy to work out because you just move the decimal point when place).

then another 5% (to give 15%) is half as much again = 0.75

1.5 + 0.75 = 2.25

15 - 2.25 = 12.75

If you're doing this on a calculator then it's 0.85 x 15

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13y ago
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15y ago

0.85 times the original value 85 percent of the original

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Q: How much is 15 percent off 15?
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