-90.77% is the change from 878 to 81
Calculation steps:
[( 81 - 878 ) ÷ 878] x 100 = -90.77%
Formula
Percentage change = [(81 - 878) / 878] x 100
Subtract the new number by the original number
81 - 878 = -797
-797 ÷ 878 = -0.907744874715262
-0.907744874715262 x 100 = -90.77%