661.25% is the change from 80 to 609
Calculation steps:
[( 609 - 80 ) ÷ 80] x 100 = 661.25%
Formula
Percentage change = [(609 - 80) / 80] x 100
Subtract the new number by the original number
609 - 80 = 529
529 ÷ 80 = 6.6125
6.6125 x 100 = 661.25%
Example