3215% is the change from 20 to 663
Calculation steps:
[( 663 - 20 ) ÷ 20] x 100 = 3215%
Formula
Percentage change = [(663 - 20) / 20] x 100
Subtract the new number by the original number
663 - 20 = 643
643 ÷ 20 = 32.15
32.15 x 100 = 3215%
Example