-88.33% is the change from 180 to 21
Calculation steps:
[( 21 - 180 ) ÷ 180] x 100 = -88.33%
Formula
Percentage change = [(21 - 180) / 180] x 100
Subtract the new number by the original number
21 - 180 = -159
-159 ÷ 180 = -0.8833333333333333
-0.8833333333333333 x 100 = -88.33%