612.35% is the change from 81 to 577
Calculation steps:
[( 577 - 81 ) ÷ 81] x 100 = 612.35%
Formula
Percentage change = [(577 - 81) / 81] x 100
Subtract the new number by the original number
577 - 81 = 496
496 ÷ 81 = 6.1234567901234565
6.1234567901234565 x 100 = 612.35%