Dr.Lee's dentist practices is open for 7 hours each day. His receptionist schedules appointments, allowing 1/2 hour for a cleani
ng and 1 hour to fill a cavity. He charges $40 for a cleaning and $95 for a filling.Dr.Lee cannot do more than 4 fillings per day.Find the number of each type of appointment that maximize Dr.Lee's income for the day.
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