3050% is the change from 20 to 630
Calculation steps:
[( 630 - 20 ) ÷ 20] x 100 = 3050%
Formula
Percentage change = [(630 - 20) / 20] x 100
Subtract the new number by the original number
630 - 20 = 610
610 ÷ 20 = 30.5
30.5 x 100 = 3050%
Example