A business rents machinery at a rate of $700 per machine each month. One machine is able to make 1000 units in a month. At most 10 machines can be housed in the factory. The monthly rent for the factory is $4900. Other expenses are $2 per unit. What is the unit cost if 8500 units are produced in a month?
- A$3.19
- B$3.23
- C$3.28
- D$3.32