1290% is the change from 40 to 556
Calculation steps:
[( 556 - 40 ) ÷ 40] x 100 = 1290%
Formula
Percentage change = [(556 - 40) / 40] x 100
Subtract the new number by the original number
556 - 40 = 516
516 ÷ 40 = 12.9
12.9 x 100 = 1290%
Example