49.75% is the change from 400 to 599
Calculation steps:
[( 599 - 400 ) ÷ 400] x 100 = 49.75%
Formula
Percentage change = [(599 - 400) / 400] x 100
Subtract the new number by the original number
599 - 400 = 199
199 ÷ 400 = 0.4975
0.4975 x 100 = 49.75%