-11.76% is the change from 170 to 150
Calculation steps:
[( 150 - 170 ) ÷ 170] x 100 = -11.76%
Formula
Percentage change = [(150 - 170) / 170] x 100
Subtract the new number by the original number
150 - 170 = -20
-20 ÷ 170 = -0.11764705882352941
-0.11764705882352941 x 100 = -11.76%