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.$$At the optimal solution,$$