700% is the change from 15 to 120
Calculation steps:
[( 120 - 15 ) ÷ 15] x 100 = 700%
Formula
Percentage change = [(120 - 15) / 15] x 100
Subtract the new number by the original number
120 - 15 = 105
105 ÷ 15 = 7
7 x 100 = 700%
Example