720.99% is the change from 81 to 665
Calculation steps:
[( 665 - 81 ) ÷ 81] x 100 = 720.99%
Formula
Percentage change = [(665 - 81) / 81] x 100
Subtract the new number by the original number
665 - 81 = 584
584 ÷ 81 = 7.209876543209877
7.209876543209877 x 100 = 720.99%