-89.86% is the change from 799 to 81
Calculation steps:
[( 81 - 799 ) ÷ 799] x 100 = -89.86%
Formula
Percentage change = [(81 - 799) / 799] x 100
Subtract the new number by the original number
81 - 799 = -718
-718 ÷ 799 = -0.8986232790988736
-0.8986232790988736 x 100 = -89.86%