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

### Instruction:
Sue and her sister buy a $2,100 car.  They agree to split the cost based on the percentage of days use.  Sue's sister will drive the car 4 days a week and Sue will get the rest of the days.  How much does Sue have to pay?

### Response:
 สูจะขับรถ 3 วันต่อสัปดาห์
ดังนั้นเธอต้องจ่าย 2100*3/7 = $<<2100*3/7=900>>900