39% is the change from 400 to 556
Calculation steps:
[( 556 - 400 ) ÷ 400] x 100 = 39%
Formula
Percentage change = [(556 - 400) / 400] x 100
Subtract the new number by the original number
556 - 400 = 156
156 ÷ 400 = 0.39
0.39 x 100 = 39%
Example