Matthew Liotine's Dream Store sells water beds and assorted supplies. His best$-$selling bed has an annual demand of $390$ units. Ordering cost is $$46$ ; holding cost is $$5$ per unit per year. To minimize the total cost, how many units should be ordered each time an order is placed? If the holding cost per unit was $$6\mathrm{.}00$ instead of $$5,$ what would the optimal order quantity be$?$ The respective answers are: