ExplanationFirst set up the first part of the question to calculate Mabel’s car cost without interest.

Let Mabel = m and Rose = r.

So, 1.12r = m and r + m = 53,000.

Substitute: Since r + 1.12r = 53,000, then 2.12r = 53,000.

Solve: r = 25,000 and m = 28,000.

Now, you can multiply m by the interest rate. (28,000)(.052) = 1,456 of interest.

Add it to the price of the car to get \(28,000 + 1,456 = 29,456\).

Hence 29,456 is the correct answer.
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Sandy

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