-85.96% is the change from 171 to 24
Calculation steps:
[( 24 - 171 ) ÷ 171] x 100 = -85.96%
Formula
Percentage change = [(24 - 171) / 171] x 100
Subtract the new number by the original number
24 - 171 = -147
-147 ÷ 171 = -0.8596491228070176
-0.8596491228070176 x 100 = -85.96%