9728.57% is the change from 7 to 688
Calculation steps:
[( 688 - 7 ) ÷ 7] x 100 = 9728.57%
Formula
Percentage change = [(688 - 7) / 7] x 100
Subtract the new number by the original number
688 - 7 = 681
681 ÷ 7 = 97.28571428571429
97.28571428571429 x 100 = 9728.57%