High School

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Where:
- [tex]\( I \)[/tex] is the interest owed.
- [tex]\( P \)[/tex] is the principal amount outstanding.
- [tex]\( r \)[/tex] is the interest rate.
- [tex]\( t \)[/tex] is the time in years.

Note: To express 1 month in terms of years, divide by 12. So, to calculate the interest over a period of 1 month, [tex]\( t = \frac{1}{12} \)[/tex].

Recall the general form for compound interest (an exponential growth model) is the equation:

[tex]\[ A = P\left(1+\frac{r}{n}\right)^{nt} \][/tex]

Where:
- [tex]\( P \)[/tex] is the principal amount, or the original amount of money before any growth occurs.
- [tex]\( r \)[/tex] is the annual nominal interest rate or the growth rate in decimal form.
- [tex]\( n \)[/tex] is the number of times the interest is compounded per year.
- [tex]\( t \)[/tex] is the number of years.
- [tex]\( A \)[/tex] is the new amount.

Formula for Interest Compounded Monthly:

[tex]\[ A = P\left(1+\frac{r}{12}\right)^{12t} \][/tex]

You made a purchase of [tex]\(\$1,000\)[/tex] on your credit card.

1. Brainstorm some things that cost [tex]\(\$1,000\)[/tex].

2. You get your monthly credit card statement and are offered the option of making a minimum payment of [tex]\(\$15\)[/tex] per month. If the credit card company charged you NO interest, how many months would it take you to pay off the [tex]\(\$1,000\)[/tex]?

3. Your credit card company has given you a moderate APR of [tex]\(13\%\)[/tex]. With this interest rate, estimate the number of months it would take you to pay off your balance of [tex]\(\$1,000\)[/tex] if you paid [tex]\(\$15\)[/tex] each month.

4. How much do you think you will end up paying in interest in the end?

Answer :

Sure! Let's tackle these questions one by one:

1. Brainstorming Things that Cost [tex]$1,000:
- A new laptop or computer.
- A round-trip airfare for an international holiday.
- A high-quality smartphone.
- Furniture set for a living room.
- A semester of college tuition at a community college.

These are just a few examples of things you might purchase for around $[/tex]1,000.

2. If No Interest is Charged:
- If you make a minimum payment of [tex]$15 each month and there is no interest charged, you can find out how many months it will take to pay off the $[/tex]1,000 by dividing the total amount by the monthly payment:
[tex]\[
\text{Number of months} = \frac{1,000}{15} \approx 66.67
\][/tex]
- So, it would take approximately 67 months to pay off the [tex]$1,000 balance without interest.

3. With an APR of 13%:
- When interest is charged, it complicates the calculation. Here, with an APR of 13%, the monthly interest rate is 13% divided by 12 months.
- To estimate how many months it would take to pay off the balance with interest, you make a $[/tex]15 payment each month, but some of it goes towards the interest.
- The calculation shows that it will take about 119 months to pay off the balance.

4. Interest Paid in the End:
- If you were to continuously pay [tex]$15 per month until the balance of $[/tex]1,000 is fully paid off, you would also be paying interest over those months.
- The total amount paid in interest is given as [tex]$785.
- So, over the term of paying off the loan, you would pay $[/tex]1,785 total, with $785 of that being interest.

This breakdown gives you a clear understanding of the time and cost involved depending on whether interest is charged or not.

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