-89.4% is the change from 764 to 81
Calculation steps:
[( 81 - 764 ) ÷ 764] x 100 = -89.4%
Formula
Percentage change = [(81 - 764) / 764] x 100
Subtract the new number by the original number
81 - 764 = -683
-683 ÷ 764 = -0.893979057591623
-0.893979057591623 x 100 = -89.4%