47.06% is the change from 170 to 250
Calculation steps:
[( 250 - 170 ) ÷ 170] x 100 = 47.06%
Formula
Percentage change = [(250 - 170) / 170] x 100
Subtract the new number by the original number
250 - 170 = 80
80 ÷ 170 = 0.47058823529411764
0.47058823529411764 x 100 = 47.06%