732.5% is the change from 80 to 666
Calculation steps:
[( 666 - 80 ) ÷ 80] x 100 = 732.5%
Formula
Percentage change = [(666 - 80) / 80] x 100
Subtract the new number by the original number
666 - 80 = 586
586 ÷ 80 = 7.325
7.325 x 100 = 732.5%
Example