-91.67% is the change from 180 to 15
Calculation steps:
[( 15 - 180 ) ÷ 180] x 100 = -91.67%
Formula
Percentage change = [(15 - 180) / 180] x 100
Subtract the new number by the original number
15 - 180 = -165
-165 ÷ 180 = -0.9166666666666666
-0.9166666666666666 x 100 = -91.67%