-39.44% is the change from 180 to 109
Calculation steps:
[( 109 - 180 ) ÷ 180] x 100 = -39.44%
Formula
Percentage change = [(109 - 180) / 180] x 100
Subtract the new number by the original number
109 - 180 = -71
-71 ÷ 180 = -0.39444444444444443
-0.39444444444444443 x 100 = -39.44%