87.65% is the change from 170 to 319
Calculation steps:
[( 319 - 170 ) ÷ 170] x 100 = 87.65%
Formula
Percentage change = [(319 - 170) / 170] x 100
Subtract the new number by the original number
319 - 170 = 149
149 ÷ 170 = 0.8764705882352941
0.8764705882352941 x 100 = 87.65%