Chance 66% to a decimal by dividing by 100. 66% = .66
Of means multiply
.66 * 15 = 9.9
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66 percent = 0.66; 66/100
20 x .66 (66%) = 13.2
(66 percent) percent of 50 = 0.33
50% of 66= 33
50 percent of 66 is the same as saying one half of 66 which is 33.