900% is the change from 7 to 70
Calculation steps:
[( 70 - 7 ) ÷ 7] x 100 = 900%
Formula
Percentage change = [(70 - 7) / 7] x 100
Subtract the new number by the original number
70 - 7 = 63
63 ÷ 7 = 9
9 x 100 = 900%
Example