(5 Points) Powered by Koffee (PBK) is a new campus coffee store. PBK uses 50 bags of whole bean coffee every month, and you may assume that demand is perfectly steady throughout the year. PBK has signed a year-long contract to purchase its coffee from a local supplier, Phish Roasters, for a price of $25 per bag and an $85 fixed cost for every delivery independent of the order size. The holding cost is $1 per bag per month. Answer the following questions: a. (2 Points) What is the per unit holding cost for a year? What is the demand for a year? b. (1 Point) What is the optimal order size, in bags? c. (1 Point) Given you answer in (a), how many times a year does PBK place orders? d. (1 Point) Given you answer in (a), how many dollars per month does PBK spend to hold coffee