Inventory

The closing inventory at cost of a company 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? Sir, in book the answer is 281200.. We know original cost and coat cost But I didn't understand how this calculated: NRV ( 75 * 95 % ) Can you please explained this to me ??