111.11% is the change from 81 to 171
Calculation steps:
[( 171 - 81 ) ÷ 81] x 100 = 111.11%
Formula
Percentage change = [(171 - 81) / 81] x 100
Subtract the new number by the original number
171 - 81 = 90
90 ÷ 81 = 1.1111111111111112
1.1111111111111112 x 100 = 111.11%