3255% is the change from 20 to 671
Calculation steps:
[( 671 - 20 ) ÷ 20] x 100 = 3255%
Formula
Percentage change = [(671 - 20) / 20] x 100
Subtract the new number by the original number
671 - 20 = 651
651 ÷ 20 = 32.55
32.55 x 100 = 3255%
Example