-71.78% is the change from 287 to 81
Calculation steps:
[( 81 - 287 ) ÷ 287] x 100 = -71.78%
Formula
Percentage change = [(81 - 287) / 287] x 100
Subtract the new number by the original number
81 - 287 = -206
-206 ÷ 287 = -0.7177700348432056
-0.7177700348432056 x 100 = -71.78%