A company gives the following details about its carriage costs. If 2000 units are transported, the total cost is $6000. If 5000 units are transported, the total cost is $13500. For quantities above 5000 units, the cost will raise the fixed charge by another $2000. What is the cost of transporting 6000 units?
- A$15500
- B$16200
- C$18000
- D$20000