85 - (15/100 x 80) = 85 - (0.15 x 80) = 73
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89 pounds minus 15% = 85% of 89 pounds = 89*85/100 pounds = 75.65 pounds
A number minus 15% is 75 So 85% of the number is 75 then the original number is 75/0.85 = 88.23529 (to 5 dp).
To find 80 percent of a number, multiply the number by 0.8. In this instance, 0.8 x 85 = 68. Therefore, 80 percent of 85 is equal to 68.
15% of 85 = 15% * 85 = 0.15 * 85 = 12.75
100*(80-68)/80 = 85%