This is the table from problem $35$ on page $176$ :

New March Demand Forecast $=C-$value $=624$

C$-$value $=\frac{393+670+806}{3}=623$

Case $3$: Mixed strategy $($allowing inventory and workforce changes from month to month$)$: Find an optimal plan $($using linear programming$)$ to meet all monthly demands $($assuming back order not allowed$)$ in order to minimize the total cost including employee hiring and firing costs and inventory carrying cost.

$(5)$ Repeat $(3),$ assuming backlog is allowed at a cost of cP $=$ $$0\mathrm{.}2/$cookie$/$month