Smyth Window has an order for $4$ products $(101,202,303,404).$ The company can assemble any or all these window products in$-$house or outsource their production to a partner company. The number of units required for each product are provided in the Smyth Window worksheet along with the unit costs to assemble the products in$-$house or to buy the products from partner.

If Smyth assembles the products in$-$house, there are three stages in this process: pick, assemble, inspect. The amount of time required for each product type in each of the three stages is given in the worksheet. Each of these three stages has a limitation on the total time available for this order.

The goal for Smyth Window is to minimize the total cost of filling the order. At the optimal solution for Smyth Window, within some range, each additional hour of picking time,

has no effect on the optimal solution.

increases the total cost by $$5\mathrm{.}00$

decreases the total cost by $$21\mathrm{.}60$

decreases the total cost by $$14\mathrm{.}40$

decreases the total cost by $$120\mathrm{.}00$

None of the answers are correct.