• Bridgeway Company manufactures printers and keyboards. The contribution margins of each printer and keyboard is $$30$ and $$20,$ respectively. Two types of skilled labor are required to manufacture these products: soldering and assembling. A printer requires $2$ hours of soldering and $1$ hour of assembling. A keyboard requires $1$ hour of soldering and $1$ hour of assembling. Bridgeway has $1,000$ soldering hours and $800$ assembling hours available per week. There are no constraints on the supply of raw materials. Demand for keyboards is unlimited, but at most $350$ printers are sold each week. Bridgeway wishes to maximize its weekly total contribution margin. Formulate a mathematical expression to decide for maximizing weekly margin for this company