-34.48% is the change from 87 to 57
Calculation steps:
[( 57 - 87 ) ÷ 87] x 100 = -34.48%
Formula
Percentage change = [(57 - 87) / 87] x 100
Subtract the new number by the original number
57 - 87 = -30
-30 ÷ 87 = -0.3448275862068966
-0.3448275862068966 x 100 = -34.48%