Please explain how i figure this problem out. My textbook has been no help and my instructor wont answer.

Net Income and Owner's Equity for Four Businesses Four different proprietorships, Jupiter, Mars, Saturn, and Venus, show the same balance sheet data at the beginning and end of a year. These data, exclusive of the amount of owner's equity, are summarized as follows: Total Assets Total Liabilities Beginning of the year $550,000 $215,000 End of the year 844,000 320,000 On the basis of the preceding data and the following additional information for the year, determine the net income (or loss) of each company for the year. (Hint: First determine the amount of increase or decrease in owner's equity during the year.) Jupite r: The owner had made no additional investments in the business and had made no withdrawa from the business. Mars: The owner had made no additional investments in the business but had withdrawn $36,000 Satur n: The owner had made an additional investment of $60,000 but had made no withdrawals. Venus : The owner had made an additional investment of $60,000 and had withdrawn $36,000