Rigid horizontal beam $AD$ is supported by two pin connected links. Due to application of $P$ end $D$ goes down by ${0\mathrm{.}1}^{\text{'}\text{'}}.$ Determine the force in each link and then the load $P.$ Bar $(1)$ is $7075-T6$ aluminum with $A_1=0\mathrm{.}5i{n}^2$ and bar $(2)$ is A$36$ steel with $A_2=0\mathrm{.}75i{n}^2.$ Which bar is closer to its yield stress?