-50.85% is the change from 177 to 87
Calculation steps:
[( 87 - 177 ) ÷ 177] x 100 = -50.85%
Formula
Percentage change = [(87 - 177) / 177] x 100
Subtract the new number by the original number
87 - 177 = -90
-90 ÷ 177 = -0.5084745762711864
-0.5084745762711864 x 100 = -50.85%