84.21% is the change from 171 to 315
Calculation steps:
[( 315 - 171 ) ÷ 171] x 100 = 84.21%
Formula
Percentage change = [(315 - 171) / 171] x 100
Subtract the new number by the original number
315 - 171 = 144
144 ÷ 171 = 0.8421052631578947
0.8421052631578947 x 100 = 84.21%