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Question 21 (10 points) The ABC Computer Store sells a printer for $600. Demand for this is constant during the year, and daily demand is forecasted to be 2 units. The cost of ordering is $90 per order, while the holding cost is $50 per unit per year. There are 250 working days per year and the lead-time is 10 days. La) Currently the company uses an ordering policy of 40 units at a time. Determine the total (sum) of the annual ordering cost and the annual holding cost for the current ordering policy? (b) is the current policy of ordering 40 units at a time optimal? Justify your