-85% is the change from 180 to 27
Calculation steps:
[( 27 - 180 ) ÷ 180] x 100 = -85%
Formula
Percentage change = [(27 - 180) / 180] x 100
Subtract the new number by the original number
27 - 180 = -153
-153 ÷ 180 = -0.85
-0.85 x 100 = -85%
Example