Hi! was there something incorrect I did here? I believe it is correct Please guide me if it is incorrect

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Metropolis Books sold 51,200 copies of a best-selling novel in July for $ 14 each. Included in each book was a $ 5 mail-in rebate for a future book purchase if the customer sends in proof of purchase with a completed rebate form. Metropolis estimates that 13% of the purchasers will claim the rebate. (a) X Your answer is incorrect. Calculate the sales revenue and the unearned revenue related to the loyalty program that Metropolis earned in July on this book. (Round answers to 0 decimal places, e.g. 5,276. Do not round intermediate calculation.) Earned revenue $ 716800 Unearned revenue $ 33280