Problem $10\mathrm{.}016$ Allowable load of two $L$ angles

A compression member of $5\mathrm{.}5-m$ effective length is made by welding together two $L15210212\mathrm{.}7$ angles as shown. Using $E=200$GPa, determine the allowable centric load for the member if a factor of safety of $2\mathrm{.}2$ is required.

The allowable centric load for the member is $kN.$