8 percent. 20% is one fifth (20/100 = 1/5), and one fifth of 40 is 8, so the answer is 8%.
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8/40 x 100 = 20 percent.
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20 is what percent of 50= 20 / 50= 0.4Converting decimal to a percentage:0.4 * 100 = 40%
20 percent of 200 = 20/100 x 200 = 4000/100 = 40
10% = $40