Problem $6$:

In the figure at right, member $(1)$ is a steel bar with a crosssectional area of $1\mathrm{.}0i{n}^2$ and a yield strength of $50$ ksi $.$ Member $(2)$ is a pair of $6061-$T$6$ aluminum bars having a combined cross$-$sectional area of $3\mathrm{.}75i{n}^2$ and a yield strength of $40$ ksi $.$ A factor of safety of at least $1\mathrm{.}6$ with respect to yield is required for both members. Determine the maximum allowable load P that may be applied to the structure. Report the factors of safety for both members at the allowable load.