at four different processing stations$($W$,$ X$,$ Y$,$ and$$ Z$).$ The operation is a batch process with small setup times that can be considered negligible. The product information$($price$,$ weekly$$ demand, and processing$$ times$)$ and process sequences are shown below. Purchased parts and raw materials$($shown as a$$ per$-$unit consumption$$ rate$)$ are represented by inverted triangles. YPI is able to make and sell up to the limit of its demand per week with no penalties incurred for not meeting the full demand. Each workstation is staffed by one highly skilled worker who is dedicated to work on that workstation alone and is paid$$ $$15$ per hour. The plant operates one$8-$hour shift per day and operates on a$5-$day work week$($i$.$e$.,40$ hours of production per person per$$ week$).$ Overhead costs are$$ $$9,000/$week$.$