315% is the change from 20 to 83
Calculation steps:
[( 83 - 20 ) ÷ 20] x 100 = 315%
Formula
Percentage change = [(83 - 20) / 20] x 100
Subtract the new number by the original number
83 - 20 = 63
63 ÷ 20 = 3.15
3.15 x 100 = 315%
Example