A retail operation sells computers. Each computer retails at $$499.$ The monthly holding cost for each computer is $$40.$ Placing an order costs $$100,$ regardless of the quantity of computers ordered. The monthly demand for computers at this operation is $320.$ Using the basic EOQ model, what are $($the economic order quantity, the average inventory level$)?$

$(40,20)$

$(41,22)$

$(39,19)$

$(42,22)$

$(28,21)$