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Question 6: Marks-(10) Waqar Sound uses a periodic inventory system. One of the store's products is a wireless headphone. The inventory quantities, purchases, and sales of this product for the most recent year are as follows: Number of units Cost per Total Unit Cost 10 150 Rs 1500 30 101 3030 40 140 5600 5 110 550 Inventory, Jan 1 First Purchase Second Purchase Third Purchase Fourth Purchase Good available for sale Units sold during the year Inventory, Dec 31 15 130 1,950 100 80 20 Instructions a. Using periodic costing procedures, compute the cost of the December 31 inventory and the cost of goods sold for the year under each of the following cost assumptions: 1. First-in, first-out. 2. Last-in, first-out. 3. Average cost (round to the nearest dollar, except unit cost)