760% is the change from 15 to 129
Calculation steps:
[( 129 - 15 ) ÷ 15] x 100 = 760%
Formula
Percentage change = [(129 - 15) / 15] x 100
Subtract the new number by the original number
129 - 15 = 114
114 ÷ 15 = 7.6
7.6 x 100 = 760%
Example