642.5% is the change from 80 to 594
Calculation steps:
[( 594 - 80 ) ÷ 80] x 100 = 642.5%
Formula
Percentage change = [(594 - 80) / 80] x 100
Subtract the new number by the original number
594 - 80 = 514
514 ÷ 80 = 6.425
6.425 x 100 = 642.5%
Example