The president of Hill Enterprises, Terri Hill, projects the firm's aggregate demand requirements over the next $8$ months as follows:

month. Ignore any idle$-$time costs. Evaluate the following plans $D$ and $E.$

additional cost of $$50$ per unit. A warehouse now constrains the maximum allowable inventory on hand to $600$ units or less.

Note: Do not produce in overtime if production or inventory are adequate to cover demand.