25.75% is the change from 400 to 503
Calculation steps:
[( 503 - 400 ) ÷ 400] x 100 = 25.75%
Formula
Percentage change = [(503 - 400) / 400] x 100
Subtract the new number by the original number
503 - 400 = 103
103 ÷ 400 = 0.2575
0.2575 x 100 = 25.75%