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To find x% of an amount A you calculate A*x/100.
Multiply the amount by 0.15
new amount minus original amount over original amount
To find the fraction of an amount or quantity you multiply the amount by the fraction.
Change the percentage to a fraction by dividing it by 100, then divide the percentage amount by this quotient to find the full amount. For example, 20 % of x = 10; 20 % = 0.20; 10/0.20 = 50.