550% is the change from 40 to 260
Calculation steps:
[( 260 - 40 ) ÷ 40] x 100 = 550%
Formula
Percentage change = [(260 - 40) / 40] x 100
Subtract the new number by the original number
260 - 40 = 220
220 ÷ 40 = 5.5
5.5 x 100 = 550%
Example