A company purchased 200 units for $40 each on 31 January It purchased 90 units for $50 on 28 February It sold 150 units for $65 each from 1 March to 31 December If the company uses the last- in, first-out inventory costing method, what is the amount of cost of sales on the income statement for the year ending 31 December? (Assume that the company uses a perpetual inventory system) OA. $12 500 B. S8 000 . s4500 O D. $6 900