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

### Instruction:
A phone factory makes twice as many phones as last year. Last year’s production was 5000 phones. If a quarter of this year’s production is sold, how many phones are left in the factory?

### Response:
They make 5000*2=<<5000*2=10000>>10000 phones this year.
They sell 10000/4=<<10000/4=2500>>2500 phones.
They are left with 10000-2500=<<10000-2500=7500>>7500 phones.
#### 7500