700% is the change from 20 to 160
Calculation steps:
[( 160 - 20 ) ÷ 20] x 100 = 700%
Formula
Percentage change = [(160 - 20) / 20] x 100
Subtract the new number by the original number
160 - 20 = 140
140 ÷ 20 = 7
7 x 100 = 700%
Example