-35.63% is the change from 87 to 56
Calculation steps:
[( 56 - 87 ) ÷ 87] x 100 = -35.63%
Formula
Percentage change = [(56 - 87) / 87] x 100
Subtract the new number by the original number
56 - 87 = -31
-31 ÷ 87 = -0.3563218390804598
-0.3563218390804598 x 100 = -35.63%