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Let find 20 percent of 66: = 66 x 20 / 100 = 1320 / 100 = 13.20 The the 20% of 66 is 13.20
30% off = 70% left. So answer = 66*70/100 = 46.20 dollars.
34 off of 60 = 66% of 60 = 39.6
66 percent = 0.66; 66/100
20 x .66 (66%) = 13.2