505% is the change from 20 to 121
Calculation steps:
[( 121 - 20 ) ÷ 20] x 100 = 505%
Formula
Percentage change = [(121 - 20) / 20] x 100
Subtract the new number by the original number
121 - 20 = 101
101 ÷ 20 = 5.05
5.05 x 100 = 505%
Example