F.3 maths plz help me!!!!!

4.Vincent and his wife had 3 children . They lived with two parents and two grandparents who were over 60 years old. Find their maximum total employment income for 2001/2002 if they did not have pay tax.
5. If Miss Poon was single and she had to pay $50000 salaries tax for 2001/2002 , find her income in the financial year 2001/2002 .(correct your answer to the nearest dollar)