1240% is the change from 40 to 536
Calculation steps:
[( 536 - 40 ) ÷ 40] x 100 = 1240%
Formula
Percentage change = [(536 - 40) / 40] x 100
Subtract the new number by the original number
536 - 40 = 496
496 ÷ 40 = 12.4
12.4 x 100 = 1240%
Example