At the beginning of the year, Ortiz Company had total assets of $900,000 and total liabilities of $440,000. Answer the following questions.

a. If total assets decreased $100,000 during the year and total liabilities increased $80,000 during the year, what is the amount of owner's equity at the end of the year?

b. During the year, total liabilities decreased $100,000 and owner's equity increased $200,000. What is the amount of total assets at the end of the year?

c. If total assets increased $50,000 during the year and owner's equity increased $60,000 during the year, what is the amount of total liabilities at the end of the year?