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45% of 20 = 45% * 20 = 0.45 * 20 = 9
20% off $45 20% equates to 20/100 so 20% of 45 = 45 x 20/100 = 9. 20% of $45 = 9 Therefore 20% off $45 = 45 - 9 = $36
45 * 20 = 900
20 percent of 45 = (20 / 100) x 45 = 9.
0.4444