Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
James takes 20 units per semester at community college.  If each unit costs $50 how much does he pay for 2 semesters?

### Response:
There are 2*20=<<2*20=40>>40 units in 2 semesters
So he pays 40*50=$<<40*50=2000>>2000
#### 2000