Rigid member ABCD is connected to two elastic bars $\frac{-}{b}arAE$ with an elastic

modulus $E_{AE}=105$GPa and cross$-$sectional area $A_{AE}=500m{m}^2$ and bar $CF$ with an

elastic modulus $E_{CF}=70$GPa and a cross$-$sectional area $A_{CF}=500m{m}^2.$ Please

determine the maximum load $P$ given that the displacement at $A$ is limited to $0\mathrm{.}5$ mm $.$