Please show your work and explain for me so I can understand better please.

3. Restaurant 3313 started business with total assets of $450,000 and total liabilities of $250,000. During the year, the restaurant recorded $735,000 in revenues, $430,000 in costs and expenses, and dividends of $105,000. Answer the following questions: a. Stockholders' Equity at the beginning of the year? b. The profit for the year? c. Stockholders' Equity at the end of the year? (assuming no tax)