8500% is the change from 8 to 688
Calculation steps:
[( 688 - 8 ) ÷ 8] x 100 = 8500%
Formula
Percentage change = [(688 - 8) / 8] x 100
Subtract the new number by the original number
688 - 8 = 680
680 ÷ 8 = 85
85 x 100 = 8500%
Example