67.65% is the change from 170 to 285
Calculation steps:
[( 285 - 170 ) ÷ 170] x 100 = 67.65%
Formula
Percentage change = [(285 - 170) / 170] x 100
Subtract the new number by the original number
285 - 170 = 115
115 ÷ 170 = 0.6764705882352942
0.6764705882352942 x 100 = 67.65%