700% is the change from 30 to 240
Calculation steps:
[( 240 - 30 ) ÷ 30] x 100 = 700%
Formula
Percentage change = [(240 - 30) / 30] x 100
Subtract the new number by the original number
240 - 30 = 210
210 ÷ 30 = 7
7 x 100 = 700%
Example