-68.93% is the change from 280 to 87
Calculation steps:
[( 87 - 280 ) ÷ 280] x 100 = -68.93%
Formula
Percentage change = [(87 - 280) / 280] x 100
Subtract the new number by the original number
87 - 280 = -193
-193 ÷ 280 = -0.6892857142857143
-0.6892857142857143 x 100 = -68.93%