8200% is the change from 8 to 664
Calculation steps:
[( 664 - 8 ) ÷ 8] x 100 = 8200%
Formula
Percentage change = [(664 - 8) / 8] x 100
Subtract the new number by the original number
664 - 8 = 656
656 ÷ 8 = 82
82 x 100 = 8200%
Example