3150% is the change from 20 to 650
Calculation steps:
[( 650 - 20 ) ÷ 20] x 100 = 3150%
Formula
Percentage change = [(650 - 20) / 20] x 100
Subtract the new number by the original number
650 - 20 = 630
630 ÷ 20 = 31.5
31.5 x 100 = 3150%
Example