-79.41% is the change from 170 to 35
Calculation steps:
[( 35 - 170 ) ÷ 170] x 100 = -79.41%
Formula
Percentage change = [(35 - 170) / 170] x 100
Subtract the new number by the original number
35 - 170 = -135
-135 ÷ 170 = -0.7941176470588235
-0.7941176470588235 x 100 = -79.41%