3210% is the change from 20 to 662
Calculation steps:
[( 662 - 20 ) ÷ 20] x 100 = 3210%
Formula
Percentage change = [(662 - 20) / 20] x 100
Subtract the new number by the original number
662 - 20 = 642
642 ÷ 20 = 32.1
32.1 x 100 = 3210%
Example