9028.57% is the change from 7 to 639
Calculation steps:
[( 639 - 7 ) ÷ 7] x 100 = 9028.57%
Formula
Percentage change = [(639 - 7) / 7] x 100
Subtract the new number by the original number
639 - 7 = 632
632 ÷ 7 = 90.28571428571429
90.28571428571429 x 100 = 9028.57%