9128.57% is the change from 7 to 646
Calculation steps:
[( 646 - 7 ) ÷ 7] x 100 = 9128.57%
Formula
Percentage change = [(646 - 7) / 7] x 100
Subtract the new number by the original number
646 - 7 = 639
639 ÷ 7 = 91.28571428571429
91.28571428571429 x 100 = 9128.57%