-97.65% is the change from 170 to 4
Calculation steps:
[( 4 - 170 ) ÷ 170] x 100 = -97.65%
Formula
Percentage change = [(4 - 170) / 170] x 100
Subtract the new number by the original number
4 - 170 = -166
-166 ÷ 170 = -0.9764705882352941
-0.9764705882352941 x 100 = -97.65%