Dave Ryan is the owner and operator of Ryan's Arcade. At the end of its accounting period, December 31, Ryan's Arcade has assets of $627,790 and liabilities of $225,090. Using the accounting equation, determine the following amounts: a) Owner's equity as of December 31 of the current year. b) Owner's equity as of December 31 at the end of the next year, assuming that assets increased by $79,070 and liabilities increased by $18,860 during the year