To find 90 percent of a number, multiply the number by 0.9. In this instance, 0.9 x 600 = 540. Therefore, 90 percent of 600 is equal to 540.
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600 x .15 = 90$ now subtract 90$ from 600$ and you get 510$
15% of 600 = 15% * 600 = 0.15 * 600 = 90
90% decrease
90 pounds
You multiply 600 by .15 because .15 is the same as 15%.