25%
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To increase a number by 15 percent, multiply the number by 1.15. For example, 60 plus 15 percent is equal to 60 x 1.15 = 69.
A 15% increase from 10.05 is: a change of 1.508 for a total of 11.56.
100*12/15 = 80 percent
The class enrollment increased by 3 students. This is the equivalent of 20%.
15% of 12 pounds = 12*15/100 = 1.8 pounds