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August 30, 2015
Posted by **Thara!** on Friday, April 2, 2010 at 4:59pm.

- Math -
**tchrwill**, Friday, April 2, 2010 at 5:59pmThe monthly payments on an 8-year loan compounded monthly at 4.75% are $100. What was the original amount of the loan?

The periodic payment, often referred to as the rent, is what must be paid, knowing only the present value, interest rate and the number of payment periods.

Example: What is the periodic payment required to retire a debt of P dollars in n periods (months or years) if payments start at the end of the first period and bear I% interest compounded periodically? For this typical loan payment calculation,

......R = Pi/[1 - (1 +i)^(-n)]

where R = the rent (periodic payment), P = the amount borrowed, n = the number of payment periods, and i = I/100.

Example: What is the annual payment required to retire a loan of $10,000 over a period of 5 years at an annual interest rate of 8%? Here, P = 10,000, n = 5, and i = .08 resulting in

R = 10000(.08)/[1 - (1.08)^-5] = $2504.56 per year.

You may now insert your values to get your answer.

- Math -
**AMY**, Friday, April 2, 2010 at 6:19pmis it $785.94?

- Math -
**Thara!**, Friday, April 2, 2010 at 6:19pm$785.8359927

round to 785.94

- Math -
**Thara!**, Friday, April 2, 2010 at 6:43pmis this correct $785.94 tchrwill?

- Math -
**Ms. Sue**, Friday, April 2, 2010 at 6:45pmHow do you round 785.835 to 785.94? Is there a typo here?

- Math -
**tchrwill**, Saturday, April 3, 2010 at 11:05amI noticed that there was an omission in my earlier post.

The periodic payment, often referred to as the rent, is what must be paid, knowing only the present value, interest rate and the number of payment periods.

Example: What is the periodic payment required to retire a debt of P dollars in n periods (months or years) if payments start at the end of the first period and bear I% interest compounded periodically? For this typical loan payment calculation,

......R = Pi/[1 - (1 +i)^(-n)]

where R = the rent (periodic payment), P = the amount borrowed, n = the number of payment periods, and i = I/100n.<---

The periodic interest, i, is I/100 divided by the number of payment periods.

For annual payments, i = I/100.

For quarterly payments, i = I/100(4). For monthly payments, i = I/100(12).

The interest rate quoted is typically stated as the annual interest rate.

Example: What is the annual payment required to retire a loan of $10,000 over a period of 5 years at an annual interest rate of 8%? Here, P = 10,000, n = 5, and i = .08 resulting in

R = 10000(.08)/[1 - (1.08)^-5] = $2504.56 per year.

You may now insert your values to get your answer.

I am assuming that the 4.75% you state is the annual percentage rate.

Then:

R = $100

i = .0475/12 = .003958

n = 8(12) = 96

100 = P(.003958)/[1 - (1.003958)^96]

making P = $7,973.81.

100(96) = $9,600 making the amouint of interest paid for borrowing the $7.978.82 9,600 - 7,978.81 = $1,621.19.

The original loan must be something less than 100(12)8 = $9,600, given monthly payments of $100 for 8 years.