89.01% is the change from 91 to 172
Calculation steps:
[( 172 - 91 ) ÷ 91] x 100 = 89.01%
Formula
Percentage change = [(172 - 91) / 91] x 100
Subtract the new number by the original number
172 - 91 = 81
81 ÷ 91 = 0.8901098901098901
0.8901098901098901 x 100 = 89.01%