Dreighton Engineering Group receives royalties on a technical manual written by two of its engineers and sold to William B. Irving Publishing, Inc. Royalties are 10% of net sales, receivable on October 1 for sales in January through June and on April 1 for sales in July through December of the prior year. Sales of the manual began in July 2012, and Dreighton accrued royalty revenue of $31,000 at December 31, 2012, as follows: Receivableroyalty revenue 31,000 Royalty revenue 31,000 Dreighton received royalties of $36,000 on April 1, 2013, and $40,000 on October 1, 2013. Irving indicated to Dreighton on December 31 that book sales subject to royalties for the second half of 2013 are expected to be $500,000. Required: 1. Prepare any journal entries Dreighton should record during 2013 related to the royalty revenue. (If no entry is required for a particular transaction, select "No journal entry required" in the first account field.) 4/1 2013 Record collection of royalties. oct 1 2013 Record collection of royalties. dec 31 2013 Record collection of royalties.Record collection of royalties.Record year end adjustment for royalties. 2. Should any adjustments be made to retained earnings or to the 2012 financial statements? Prepare any journal entries if required. (If no entry is required for a particular event, select "No journal entry required" in the first account field.) Record change in estimate