1250% is the change from 40 to 540
Calculation steps:
[( 540 - 40 ) ÷ 40] x 100 = 1250%
Formula
Percentage change = [(540 - 40) / 40] x 100
Subtract the new number by the original number
540 - 40 = 500
500 ÷ 40 = 12.5
12.5 x 100 = 1250%
Example