Ricki is working a part-time job this summer. The table shows how many hours she worked each day during her first week.

Day: Monday
Hours Worked: 4

Day: Tuesday
Hours Worked: 0

Day: Wednesday
Hours Worked: 5

Day: Thursday
Hours Worked: 5

Day: Friday
Hours Worked: 0

Day: Saturday
Hours Worked: 3

Day: Sunday
Hours Worked: 3

This week is representative of how many hours Ricki will work each week during the summer. If she earns $9 per hour and there are 12 weeks during her summer vacation, what will Ricki's gross earnings be? Explain your reasoning.