3140% is the change from 20 to 648
Calculation steps:
[( 648 - 20 ) ÷ 20] x 100 = 3140%
Formula
Percentage change = [(648 - 20) / 20] x 100
Subtract the new number by the original number
648 - 20 = 628
628 ÷ 20 = 31.4
31.4 x 100 = 3140%
Example