71.18% is the change from 170 to 291
Calculation steps:
[( 291 - 170 ) ÷ 170] x 100 = 71.18%
Formula
Percentage change = [(291 - 170) / 170] x 100
Subtract the new number by the original number
291 - 170 = 121
121 ÷ 170 = 0.711764705882353
0.711764705882353 x 100 = 71.18%