Can i please have a detailed explanation of the theory behind this please?

6.3 The closing inventory at cost of Darcy Co at 31 January 20x3 amounted to $284,700. The following items were included at cost in the total: 1 400 coats, which had cost $80 each and normally sold for $150 each. Owing to a defect in manufacture, they were all sold after the reporting date at 50% of their normal price. Selling expenses amounted to 5% of the proceeds. 2. 800 skirts, which had cost $20 each. These too were found to be defective. Remedial work in February 20x3 cost $5 per skirt, and selling expenses for the batch totalled $800. They were sold for $28 each. What should the inventory value be according to IAS 2 Inventories after considering the above items? $276,400 B $281,200 $282,800 D $329,200 (2 marks)