Piecewise Linear Functions

Parking garages often offer different prices based on how long you are parked. There is an hourly rate of $5$ dollars per hour; however, if you are parked for $5$ or more hours there is a flat rate of $12$ dollars. If you are parked for $10$ or more hours, the cost is $12$ dollars plus an extra $3$ per hour past $10$ hours up to $24$ hours. What is the piecewise function that represents the pricing of a parking garage?