A car can be rented for a maximum of 12 days. The rental company charges $32 per day for thefirst5days,thendays6and7arefree,thendays8through12areagain$32perday. Let A(t) be the average cost per day to rent for t days, 0 ≤ t ≤ 12. At how many points is A(t) discontinuous?
