50.75% is the change from 400 to 603
Calculation steps:
[( 603 - 400 ) ÷ 400] x 100 = 50.75%
Formula
Percentage change = [(603 - 400) / 400] x 100
Subtract the new number by the original number
603 - 400 = 203
203 ÷ 400 = 0.5075
0.5075 x 100 = 50.75%