128.65% is the change from 171 to 391
Calculation steps:
[( 391 - 171 ) ÷ 171] x 100 = 128.65%
Formula
Percentage change = [(391 - 171) / 171] x 100
Subtract the new number by the original number
391 - 171 = 220
220 ÷ 171 = 1.286549707602339
1.286549707602339 x 100 = 128.65%