Give the step-by-step reasoning process and then the final answer. 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?
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Sue will drive 7 - 4 = 3 days a week. So she will pay 2100 * 3 / 7 = $900.
The final answer: 900.
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