3900% is the change from 4 to 160
Calculation steps:
[( 160 - 4 ) ÷ 4] x 100 = 3900%
Formula
Percentage change = [(160 - 4) / 4] x 100
Subtract the new number by the original number
160 - 4 = 156
156 ÷ 4 = 39
39 x 100 = 3900%
Example