-58.82% is the change from 170 to 70
Calculation steps:
[( 70 - 170 ) ÷ 170] x 100 = -58.82%
Formula
Percentage change = [(70 - 170) / 170] x 100
Subtract the new number by the original number
70 - 170 = -100
-100 ÷ 170 = -0.5882352941176471
-0.5882352941176471 x 100 = -58.82%