Sarah works 5 hours per day on Monday, Tuesday, and Thursday and 7 and a half hours per day on Wednesday and Friday. She does not work on Saturday and Sunday. If she earns 324 dollars per week, what is her average earning rate in dollars per hour?
On Monday, Tuesday, and Thursday she works for 15 hours and on Wednesday and Friday she works for 15 hours. That is a total of 30 hours. So \(324 \div 30=10.80\)