500% is the change from 21 to 126
Calculation steps:
[( 126 - 21 ) ÷ 21] x 100 = 500%
Formula
Percentage change = [(126 - 21) / 21] x 100
Subtract the new number by the original number
126 - 21 = 105
105 ÷ 21 = 5
5 x 100 = 500%
Example