2900% is the change from 8 to 240
Calculation steps:
[( 240 - 8 ) ÷ 8] x 100 = 2900%
Formula
Percentage change = [(240 - 8) / 8] x 100
Subtract the new number by the original number
240 - 8 = 232
232 ÷ 8 = 29
29 x 100 = 2900%
Example