33.59% is the change from 128 to 171
Calculation steps:
[( 171 - 128 ) ÷ 128] x 100 = 33.59%
Formula
Percentage change = [(171 - 128) / 128] x 100
Subtract the new number by the original number
171 - 128 = 43
43 ÷ 128 = 0.3359375
0.3359375 x 100 = 33.59%