700% is the change from 100 to 800
Calculation steps:
[( 800 - 100 ) ÷ 100] x 100 = 700%
Formula
Percentage change = [(800 - 100) / 100] x 100
Subtract the new number by the original number
800 - 100 = 700
700 ÷ 100 = 7
7 x 100 = 700%
Example