20% of 15 = 0.20 * 15 = 3
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If you mean 20% of 15 that's 3. If you mean 20% off that's 15-3 or 12.
25% off of 20 = 15= 25% discount applied to 20= 20 - (25% * 20)= 20 - (0.25 * 20)= 20 - 5= 15
17 pounds.
40 percent of 50 = $20
15 x .20 = $3 discount finalprice = 15 - 3 = $12