46.78% is the change from 171 to 251
Calculation steps:
[( 251 - 171 ) ÷ 171] x 100 = 46.78%
Formula
Percentage change = [(251 - 171) / 171] x 100
Subtract the new number by the original number
251 - 171 = 80
80 ÷ 171 = 0.4678362573099415
0.4678362573099415 x 100 = 46.78%