7000% is the change from 9 to 639
Calculation steps:
[( 639 - 9 ) ÷ 9] x 100 = 7000%
Formula
Percentage change = [(639 - 9) / 9] x 100
Subtract the new number by the original number
639 - 9 = 630
630 ÷ 9 = 70
70 x 100 = 7000%
Example