Math Problem Statement

Most people do not have the choice to drive or fly to a destination close to home but perhaps we will in the future. Two​ companies, one in Massachusetts and one in​ Slovakia, are working on producing a flying car. A prototype has entered the testing phase in Slovakia and the Massachusetts company is working on perfecting retractable wings on their car model. Although mass production has not​ begun, the prototypes have successfully reached lift off with ranges of just over 400 miles and speeds just over 100 miles per hour. ​Source: Marquis, E.​ "Aeromobil 2.5 flying car makes first flight​ test." AolAutos. 25 Oct 2013. Retrieved from​ http://translogic.aolautos.com/2013/10/25/aeromobil-2-5-flying-car-makes-first-test-flight/ Question content area bottom Part 1 Suppose the sticker price on a particular car was​ 17,090. A consumer expects to qualify for a rebate of​ $4,500 and receive an additional​ $3,500 for trading in his current car. Six years ago the consumer invested​ $7,500 in a savings account earning​ 2% APR compounded monthly. To the nearest dollar how much would the consumer have saved to purchase the​ car? Total saved would be ​$    enter your response here. ​(Round to the nearest dollar as​ needed.)

Solution

To calculate how much the consumer would have saved in the savings account, we need to use the formula for compound interest:

A=P(1+rn)ntA = P \left(1 + \frac{r}{n}\right)^{nt}

where:

  • AA is the amount of money saved after interest,
  • P=7,500P = 7,500 is the initial principal (the amount the consumer invested),
  • r=0.02r = 0.02 is the annual interest rate (2%),
  • n=12n = 12 is the number of times the interest is compounded per year (monthly compounding),
  • t=6t = 6 is the number of years the money was invested.

Let's calculate this.

A=7,500(1+0.0212)12×6A = 7,500 \left(1 + \frac{0.02}{12}\right)^{12 \times 6}The consumer would have saved $8,455 after six years in the savings account.

Would you like further details or have any other questions?

Here are five related questions:

  1. How would the amount change if the interest rate was 3% instead of 2%?
  2. What if the consumer had invested $10,000 instead of $7,500? How much would they have saved?
  3. How does compounding frequency (monthly vs. yearly) affect the final amount?
  4. How long would it take to double the investment with a 2% interest rate compounded monthly?
  5. How would the savings change if the consumer made additional contributions each month?

Tip: Always check how often the interest compounds, as more frequent compounding will increase your total returns!

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Math Problem Analysis

Mathematical Concepts

Compound Interest
Exponential Growth

Formulas

Compound Interest Formula: A = P(1 + r/n)^(nt)

Theorems

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Suitable Grade Level

Grades 10-12