Company XYZ is a merchandising business. The company is specialized in selling a specific brand of smartphones. The purchase cost per unit was OMR310. At the beginning of the month of May the company has inventory of 1,260 smartphones. During the month of May, the company purchased additional 1,000 smartphones. By the end of May, the company had 440 smartphones remaining in the store. The selling and general expenses for the company include wages and commissions, which include fixed monthly payment of OMR1,600 plus a OMR9 per unit sold; and depreciation of OMR2,000 per month. Assuming a selling price per unit of OMR620, calculate the total contribution margin. Select one: a. OMR547,820 b. OMR544,220 c. OMR564,200 d. OMR379,260 e. None of the given answers