-50% is the change from 174 to 87
Calculation steps:
[( 87 - 174 ) ÷ 174] x 100 = -50%
Formula
Percentage change = [(87 - 174) / 174] x 100
Subtract the new number by the original number
87 - 174 = -87
-87 ÷ 174 = -0.5
-0.5 x 100 = -50%
Example