An entrepreneur purchases a workshop for $10000 in order to produce picture frames. During the first year, he spent $40000 on materials and hired two workers. He paid the workers according to each frame made, and this came to a total of $30000. He also bought a vehicle for $10000 to deliver the frames. What did his total variable costs amount to?
- A$40000
- B$70000
- C$80000
- D$100000