$ 467,260 510,290 $ 394,160 a. Stockholders' equity as of December 31, 2017. b. Stockholders' equity as of December 31, 2018, assuming that assets increased by $107,930 and liabilities increased by $64,900 during 2018. c. Stockholders' equity as of December 31, 2018, assuming that assets decreased by $53,970 and liabilities increased by $19,130 during 2018. d. Stockholders' equity as of December 31, 2018, assuming that assets increased by $90,170 and liabilities decreased by $34,160 during 2018. e. Net Income (or net loss) during 2018, assuming that as of December 31, 2018, assets were $860,740, liabilities were $140,040, and no additional capital stock was issued or dividends paid. 591,590 Net Income $ 720,700 X