Math Problem Statement

You want to buy a new car. You can afford payments of $250 per month and can borrow the money at an interest rate of 3.1% compounded monthly for 5 years.

How much are you able to borrow?

Solution

To determine how much you can borrow, we can use the formula for the present value of an annuity, which is often used for calculating loans:

PV=P×[1(1+r)nr]PV = P \times \left[ \frac{1 - (1 + r)^{-n}}{r} \right]

Where:

  • PVPV = present value (amount you can borrow)
  • PP = monthly payment ($250)
  • rr = monthly interest rate (annual rate divided by 12)
  • nn = total number of payments (months)

Step-by-step breakdown:

  1. Monthly interest rate rr: r=3.1%12=0.03112=0.0025833r = \frac{3.1\%}{12} = \frac{0.031}{12} = 0.0025833

  2. Total number of payments nn: Since the loan is for 5 years, and there are 12 months in a year: n=5×12=60n = 5 \times 12 = 60

  3. Substitute into the formula: PV=250×[1(1+0.0025833)600.0025833]PV = 250 \times \left[ \frac{1 - (1 + 0.0025833)^{-60}}{0.0025833} \right]

Now I'll calculate the value.You are able to borrow approximately $13,878.74.

Would you like further details or have any questions about the calculations?

Here are some related questions to explore:

  1. How would a higher interest rate affect the loan amount you can borrow?
  2. What if you could afford payments of $300 per month instead?
  3. How does increasing the loan term to 7 years change the amount you can borrow?
  4. What if the interest was compounded quarterly instead of monthly?
  5. How much interest will you pay over the life of the loan?

Tip: The longer the loan term, the lower your monthly payments, but the more interest you pay overall.

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Math Problem Analysis

Mathematical Concepts

Annuities
Present Value
Interest Rates
Compounding

Formulas

Present Value of Annuity: PV = P × [(1 - (1 + r)^-n) / r]

Theorems

Time Value of Money

Suitable Grade Level

Grade 10-12