51.25% is the change from 80 to 121
Calculation steps:
[( 121 - 80 ) ÷ 80] x 100 = 51.25%
Formula
Percentage change = [(121 - 80) / 80] x 100
Subtract the new number by the original number
121 - 80 = 41
41 ÷ 80 = 0.5125
0.5125 x 100 = 51.25%
Example