3250% is the change from 20 to 670
Calculation steps:
[( 670 - 20 ) ÷ 20] x 100 = 3250%
Formula
Percentage change = [(670 - 20) / 20] x 100
Subtract the new number by the original number
670 - 20 = 650
650 ÷ 20 = 32.5
32.5 x 100 = 3250%
Example