The daily parking garage at BWI Airport charges $3.00 per hour for the first two hours, and $2.00 per hour for the third, fourth, and fifth hours. The rate holds at $12 for the remainder of the first twenty-four period which begins when a driver enters the garage. The rate repeats for each additional twenty-four hour period. Find the parking charge at this garage for the following parking durations.
a. 4 hours ____________
b. 9 hours ____________
c. 26 hours ____________