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? Give me reasons, before answering the question
Sue will drive 7 - 4 = 3 days a week. So she will pay 2100 * 3 / 7 = $900. So the final answer is 900.