A single model assembly lime is being planned to produce a consumer appliance at the rate of $90\mathrm{.}000$ units year The line will be operated at $50$ weeks year, $5$ shifts$/$week$,$ and $6$ hours$/$shift There will be one worker per station. Previous experience suggests that the uptime efficiency for the line will be $100\%$ and there is no repositioning time. The work elements, their times and

precedence consuaints are given in the table below