2. Details of invoices for purchases of merchandise are as follows: Merchandise $800 4,600 2,400 7,500 Returns and Allowances $200 800 600 Freight S45 Terms FOB shipping point, 1/10, n/30 FOB destination, n/30 FOB shipping point, 2/10, n/30 FOB destination, 1/10, n/30 Determine the amount to be paid in full settlement of each of the invoices, assuming that credit for returns and allowances was received prior to payment and that all invoices were paid within the discount period. 3. The beginning inventory and purchases of an item for the period were as follows Beginning inventory First purchase Second purchase Third purchase 6 units at $70 each 10 units at $75 each 18 units at $80 each 10 units at $85 each The company uses the periodic system, and there were 15 units in the inventory at the end of the period. Determine the cost of the 15 units in the inventory by each of the following methods, presenting details of your computations: (a) first-in, first-out; (b) last-in, first-out; (c) average cost