FJ is a retailer of mobile phones. Customers are entitled to return items within 30 days for a full refund if they change their mind and the phones are unopened in their original packaging. In the final week of December 20X4, FJ sold 200 mobile phones to customers for $500 each. FJ had purchased the phones from the manufacturer for $300 each. Using the expected value model, FJ estimates that 80% of the products will not be returned and none of the phones sold in the final week of December 20X4 had been returned by the 31 December 20X4 year end. FJ holds a sale every January and will reduce the selling price of this particular mobile phone to $450. Which THREE of the following will appear in the financial statements of FJ for the year ended 31 December 20X4 in relation to these mobile phones  and why?  a. Contract liability of $100,000 b. Revenue of $100,000 c. Asset for right to recover phones $12,000 d. Cost of sales of $60,000 e. Revenue of $80,000 f. Refund liability of $20,000