Solve the Problem $\$ 30$ Per Day or Portion of a Day to Rent a Per

Multiple Choice

Solve the problem.}
-A car rental firm charged $\$ 30$ per day or portion of a day to rent a car for a period of 1 to 5 days. Days 6 to 7 were then "free," while the charge for days 8 through 15 was again $\$ 30$ per day. Let $\mathrm{C}(\mathrm{t})$ represent the total cost to rent the car for $\mathrm{t}$ days, where $0<\mathrm{t} \leq 15$ . Find the total cost of a rental for 6 days.

A) $\$ 180$
B) $\$ 150$
C) $\$ 30$
D) $\$ 36$