798.77% is the change from 81 to 728
Calculation steps:
[( 728 - 81 ) ÷ 81] x 100 = 798.77%
Formula
Percentage change = [(728 - 81) / 81] x 100
Subtract the new number by the original number
728 - 81 = 647
647 ÷ 81 = 7.987654320987654
7.987654320987654 x 100 = 798.77%