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Otto Lite is a merchandising company that uses the periodic inventory system. Selected account balances are listed below: Sales $105,000 Purchases 54,000 Beginning Inventory 13,800 Ending Inventory 10,200 Purchase Returns and Allowances 1,800 Purchase Discounts 4,200 Transportation in 2,400 Sales Discounts 4,800 Sales Returns and Allowances 3,000 Refer to the information provided for Otto Lite. Calculate the company's gross margin. a $43,200 Ob.$51,000 O c $40,800 O d. $46,800