48.15% is the change from 81 to 120
Calculation steps:
[( 120 - 81 ) ÷ 81] x 100 = 48.15%
Formula
Percentage change = [(120 - 81) / 81] x 100
Subtract the new number by the original number
120 - 81 = 39
39 ÷ 81 = 0.48148148148148145
0.48148148148148145 x 100 = 48.15%