405% is the change from 20 to 101
Calculation steps:
[( 101 - 20 ) ÷ 20] x 100 = 405%
Formula
Percentage change = [(101 - 20) / 20] x 100
Subtract the new number by the original number
101 - 20 = 81
81 ÷ 20 = 4.05
4.05 x 100 = 405%
Example