Discuss the below:
Q: Madeline Thimmes's Dream Store sells waterbeds and assorted supplies. Her best-selling bed has an annual demand of 400 units. Ordering cost is $40; 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 instead of $5, what would be optimal order quantity?