please explain how to do it

Blue Fin started the current year with assets of $701,000, liabilities of $350,500 and common stock of $201.000. During the current year, assets increased by $401,000, liabilities decreased by $50,500 and common stock increased by $276,000. There was no payment of dividends to owners during the year. Based on this information, what was the amount of Blue Fin's retained earnings at the beginning of the year? Multiple Choice $149,500 $74.500 5551.500 S451500