$4\mathrm{.}8$ Andrew McGregor forecast weekly demand for MP$411$ pumps

as follows:

Each pump costs $80,$ it costs $800$ to place an order and get

delivery, and holding cost is $20\%$ of value a year. Design a

reasonable ordering policy for the pump. How much does this

cost a year?

Week $1234567891011$

Demand $161021187432415$

Week $1213141516171819202122$

Demand $27385140221286723$