8150% is the change from 8 to 660
Calculation steps:
[( 660 - 8 ) ÷ 8] x 100 = 8150%
Formula
Percentage change = [(660 - 8) / 8] x 100
Subtract the new number by the original number
660 - 8 = 652
652 ÷ 8 = 81.5
81.5 x 100 = 8150%
Example