9042.86% is the change from 7 to 640
Calculation steps:
[( 640 - 7 ) ÷ 7] x 100 = 9042.86%
Formula
Percentage change = [(640 - 7) / 7] x 100
Subtract the new number by the original number
640 - 7 = 633
633 ÷ 7 = 90.42857142857143
90.42857142857143 x 100 = 9042.86%