7100% is the change from 9 to 648
Calculation steps:
[( 648 - 9 ) ÷ 9] x 100 = 7100%
Formula
Percentage change = [(648 - 9) / 9] x 100
Subtract the new number by the original number
648 - 9 = 639
639 ÷ 9 = 71
71 x 100 = 7100%
Example