300% is the change from 240 to 960
Calculation steps:
[( 960 - 240 ) ÷ 240] x 100 = 300%
Formula
Percentage change = [(960 - 240) / 240] x 100
Subtract the new number by the original number
960 - 240 = 720
720 ÷ 240 = 3
3 x 100 = 300%
Example