Some doctors use the formula ND = 1.08T to relate the variables N (the number of patient appointments the doctor schedules in one day), D (the duration of each patient appointment), and T (the total number of minutes the doctor can use to see the patients in one day). Solve the formula for N. Use this result to find the number of patient appointments N a doctor should make if she has 6 hours available for patients and each appointment is 15 minutes long.