The annual demand for a product is $15,600$ units. The weekly demand is $300$ units with a standard deviation of $90$ units. The cost to place an order is $$31\mathrm{.}20,$ and the time from ordering to receipt is four weeks. The annual inventory carrying cost is $$0\mathrm{.}10$ per unit. How much to order? Find the optimal ordering quantity. When to order? Find the reorder point necessary to provide a $96\%$ service level. Compose a sentence of inventory policy.