Multiply the amount by 0.15
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To increase an amount by 15 percent, you should multiply it by 1.15. This is because 1 represents the original amount, and 0.15 represents the 15 percent increase. For example, if you have an amount of $100, multiplying it by 1.15 results in $115, which reflects the 15 percent increase.
First find 10% by dividing the total amount by 10. So 10% of 15 = 1.5 Now subtract 10% from the original amount to get 15 - 1.5 = 13.5
17.85
.15x = 6 Divide both sides by .15 6/.15 = 40 15 percent of 40 is 6.
15% of 20 is 3 . 3 is the same amount as 300% .