You are in charge of inventory control of a highly successful product retailed by your firm. Weekly demand for this item varies, with an average of...

You are in charge of inventory control of a highly successful product retailed by your firm. Weekly demand for this item varies, with an average of 200 units and a standard deviation of 16 units. It is purchased from a wholesaler at a cost of Rs. 12.50 per unit. The supply lead time is 4 weeks. Placing an order costs Rs. 50 and the inventory carrying cost is 20% of the item’s cost per year. Assume you operate for 52 weeks in a year. a.