Sue and her sister buy a $2,100 car.  They agree to split the cost based on the percentage of days use.  Sue's sister will drive the car 4 days a week and Sue will get the rest of the days.  How much does Sue have to pay?
Sue will drive 7-4=<<7-4=3>>3 days a week
So she will pay 2100*3/7=$<<2100*3/7=900>>900
#### 900