160% is the change from 15 to 39
Calculation steps:
[( 39 - 15 ) ÷ 15] x 100 = 160%
Formula
Percentage change = [(39 - 15) / 15] x 100
Subtract the new number by the original number
39 - 15 = 24
24 ÷ 15 = 1.6
1.6 x 100 = 160%
Example