A new small electrical appliance is to be assembled on a single$-$model assembly line. The wile will be

operated $250$ days per year, $15$ hours per day. The work content has been divided into elements defined

in the table below. Also given are the precedence times and precedence requirements. Annual

production is to be $200,000$ units. It is anticipated that line efficiency will be $0\mathrm{.}96.$ Repositioning time for

each worker is $0\mathrm{.}98$ minutes