$10\mathrm{.}4\mathrm{.}16$ A balanced three$-$phase wye$-$wye system has two parallel loads. Load $1$ is rated at $4000VA,0\mathrm{.}9$ pf lagging, and load $2$ is rated at $3600VA,0\mathrm{.}85pf$ leading. If the line voltage is $208$ V rms $,$ determine the magnitude of the line current.