7925% is the change from 8 to 642
Calculation steps:
[( 642 - 8 ) ÷ 8] x 100 = 7925%
Formula
Percentage change = [(642 - 8) / 8] x 100
Subtract the new number by the original number
642 - 8 = 634
634 ÷ 8 = 79.25
79.25 x 100 = 7925%
Example