724.69% is the change from 81 to 668
Calculation steps:
[( 668 - 81 ) ÷ 81] x 100 = 724.69%
Formula
Percentage change = [(668 - 81) / 81] x 100
Subtract the new number by the original number
668 - 81 = 587
587 ÷ 81 = 7.246913580246914
7.246913580246914 x 100 = 724.69%