3015% is the change from 20 to 623
Calculation steps:
[( 623 - 20 ) ÷ 20] x 100 = 3015%
Formula
Percentage change = [(623 - 20) / 20] x 100
Subtract the new number by the original number
623 - 20 = 603
603 ÷ 20 = 30.15
30.15 x 100 = 3015%
Example