843.21% is the change from 81 to 764
Calculation steps:
[( 764 - 81 ) ÷ 81] x 100 = 843.21%
Formula
Percentage change = [(764 - 81) / 81] x 100
Subtract the new number by the original number
764 - 81 = 683
683 ÷ 81 = 8.432098765432098
8.432098765432098 x 100 = 843.21%