-90.21% is the change from 827 to 81
Calculation steps:
[( 81 - 827 ) ÷ 827] x 100 = -90.21%
Formula
Percentage change = [(81 - 827) / 827] x 100
Subtract the new number by the original number
81 - 827 = -746
-746 ÷ 827 = -0.9020556227327691
-0.9020556227327691 x 100 = -90.21%