40.35% is the change from 171 to 240
Calculation steps:
[( 240 - 171 ) ÷ 171] x 100 = 40.35%
Formula
Percentage change = [(240 - 171) / 171] x 100
Subtract the new number by the original number
240 - 171 = 69
69 ÷ 171 = 0.40350877192982454
0.40350877192982454 x 100 = 40.35%