15.3
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17 __ x 90 = 15.3 100
90
It is 90 because 90% of 90 = 81
90% of 90 = 90*90/100 = 81
To find 90 percent of a number, multiply the number by 0.9. In this instance, 0.9 x 256 = 230.4. Therefore, 90 percent of 256 is equal to 230.4.