$6$ points$)$ Under the continuous review policy, the average daily demand for Apple Ipad

$10\mathrm{.}9$ inch at a Circuit Town store is $15,$ with a standard deviation of $5$ units. The lead time

is constant at $2$ days. If the management wants a $90\%$ cycle service level.

a$.(2$ points $)$How much of this is safety stock?

b$.(2$ points $)$What is the reorder point?

c$.(2$ points$)$ If the order quantity is at EOQ, which through calculation we get $250$ units,

please describe the order policy in words.