1. Sin-Den Co. used perpetual inventory system. The company had the following purchases and sales in J#., 20X1: Date Transaction Quantity Unit cost/price Amount Jan. 1 30 $ 7 $ 210 Jan. 5 Purchase 50 9 450 Jan. 10 Sale (40) 12 480 Jan. 24 Purchase 60 10 600 Jan. 30 Sale (50) 13 650 Use moving average method to calculate the ending inventory and the cost of goods sold for Jan., 20X1. (Ending inventory: 6 points; cost of goods sold: 5 points; Total 11 points)