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Riley is buying a new car. The sticker price on the car is $16,999. The bank has offered

him a loan that has 3.9% APR for 4 years. If Riley is required to pay a 10% down payment
and sales tax in Texas is 6.25%, how much money will Riley pay over the life of the loan?
$18,765
$19,535
O $19,397
$16,999
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1 Answer

4 votes

Answer:

$19,389

Explanation:

The amount Riley is being charged for the car is ...

(sticker price) + tax = 16,999 + 0.0625·16,999 = 16,999 +1062.44 = 18061.44

The amount he is paying as a down payment is 10& of this value:

down payment = 10% · $18,061.44 = $1,806.14

Then the amount being financed is ...

financed amount = purchase price - down payment

= $18,061.44 -1,806.14 = $16,255.30

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The amortization formula is good for finding the monthly payment.

A = P(r/12)/(1 -(1 +r/12)^(-12t))

where P is the amount financed at rate r for t years.

A = $16,255.30(0.039/12)/(1 -(1 +0.039/12)^(-12·4)) = $366.30

The total Riley will pay is the sum of the monthly payments and the initial down payment:

total paid = 48·$366.30 +1,806.14 = $19,388.54 ≈ $19,389

The closest offered choice is $19,397.

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Comment on answer choices

We suspect the answer key computation involved some rounding somewhere.

User Evgeniy Mishustin
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