395% is the change from 20 to 99
Calculation steps:
[( 99 - 20 ) ÷ 20] x 100 = 395%
Formula
Percentage change = [(99 - 20) / 20] x 100
Subtract the new number by the original number
99 - 20 = 79
79 ÷ 20 = 3.95
3.95 x 100 = 395%
Example