-95% is the change from 180 to 9
Calculation steps:
[( 9 - 180 ) ÷ 180] x 100 = -95%
Formula
Percentage change = [(9 - 180) / 180] x 100
Subtract the new number by the original number
9 - 180 = -171
-171 ÷ 180 = -0.95
-0.95 x 100 = -95%
Example