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

### Instruction:
Chris buys 2 and a half dozen donuts on his way to work to share with his co-workers.  While driving, he eats 10% of the donuts.  Once inside, he grabs another 4 donuts for his afternoon snack.  How many donuts are left for his co-workers?

### Response:
 เขาซื้อโดนัท 2.5*12=<<2.5*12=30>>30 โดนัท
เขากินโดนัท 30(.10)=3 โดนัท
เหลือโดนัท 30-3-4=<<30-3-4=23>>23 โดนัทให้เพื่อนร่วมงาน