-35.88% is the change from 170 to 109
Calculation steps:
[( 109 - 170 ) ÷ 170] x 100 = -35.88%
Formula
Percentage change = [(109 - 170) / 170] x 100
Subtract the new number by the original number
109 - 170 = -61
-61 ÷ 170 = -0.3588235294117647
-0.3588235294117647 x 100 = -35.88%