7950% is the change from 8 to 644
Calculation steps:
[( 644 - 8 ) ÷ 8] x 100 = 7950%
Formula
Percentage change = [(644 - 8) / 8] x 100
Subtract the new number by the original number
644 - 8 = 636
636 ÷ 8 = 79.5
79.5 x 100 = 7950%
Example