Dave Ryan is the CEO of Ryan's Arcade. At the end its accounting period, December 31, Ryan's Arcade has assets of $649,110 and liabilities of $246,520. Using the accounting equation, determine the following amounts: a. Stockholders' equity as of December 31 of the current year, b. Stockholders' equity as of December 31 at the end of the next year, assuming that assets increased by $85,100 and abilities increased by $18,200 during the year