725% is the change from 80 to 660
Calculation steps:
[( 660 - 80 ) ÷ 80] x 100 = 725%
Formula
Percentage change = [(660 - 80) / 80] x 100
Subtract the new number by the original number
660 - 80 = 580
580 ÷ 80 = 7.25
7.25 x 100 = 725%
Example