Math Project- need help with car APR.?

My teacher gave us imaginary lives with kids, job, etc but no credit scores. We have to figure out what kind of home, car, etc we can afford. Now I already calculated mortgage payments, and I know the math will be similar for a car payment but I have no idea what APR to use. For our home the class used the National... show more My teacher gave us imaginary lives with kids, job, etc but no credit scores. We have to figure out what kind of home, car, etc we can afford. Now I already calculated mortgage payments, and I know the math will be similar for a car payment but I have no idea what APR to use. For our home the class used the National mortgage rate for that day, so what can I do to find a car's APR since I have no credit score?

Is there anywhere I can find a national average or something?
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