-86.21% is the change from 87 to 12
Calculation steps:
[( 12 - 87 ) ÷ 87] x 100 = -86.21%
Formula
Percentage change = [(12 - 87) / 87] x 100
Subtract the new number by the original number
12 - 87 = -75
-75 ÷ 87 = -0.8620689655172413
-0.8620689655172413 x 100 = -86.21%