197.8% is the change from 91 to 271
Calculation steps:
[( 271 - 91 ) ÷ 91] x 100 = 197.8%
Formula
Percentage change = [(271 - 91) / 91] x 100
Subtract the new number by the original number
271 - 91 = 180
180 ÷ 91 = 1.978021978021978
1.978021978021978 x 100 = 197.8%