82.46% is the change from 171 to 312
Calculation steps:
[( 312 - 171 ) ÷ 171] x 100 = 82.46%
Formula
Percentage change = [(312 - 171) / 171] x 100
Subtract the new number by the original number
312 - 171 = 141
141 ÷ 171 = 0.8245614035087719
0.8245614035087719 x 100 = 82.46%