-89.96% is the change from 807 to 81
Calculation steps:
[( 81 - 807 ) ÷ 807] x 100 = -89.96%
Formula
Percentage change = [(81 - 807) / 807] x 100
Subtract the new number by the original number
81 - 807 = -726
-726 ÷ 807 = -0.8996282527881041
-0.8996282527881041 x 100 = -89.96%