-73.53% is the change from 170 to 45
Calculation steps:
[( 45 - 170 ) ÷ 170] x 100 = -73.53%
Formula
Percentage change = [(45 - 170) / 170] x 100
Subtract the new number by the original number
45 - 170 = -125
-125 ÷ 170 = -0.7352941176470589
-0.7352941176470589 x 100 = -73.53%