109.88% is the change from 81 to 170
Calculation steps:
[( 170 - 81 ) ÷ 81] x 100 = 109.88%
Formula
Percentage change = [(170 - 81) / 81] x 100
Subtract the new number by the original number
170 - 81 = 89
89 ÷ 81 = 1.0987654320987654
1.0987654320987654 x 100 = 109.88%