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Professor's Annuity Corp. offers a lifetime annuity to retiring professors. For a payment of...

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Professor's Annuity Corp. offers a lifetime annuity to retiring professors. For a payment of $71,000 at age 65, the firm will pay the retiring professor $375 a month until death.

a. If the professor's remaining life expectancy is 20 years, what is the monthly interest rate on this annuity? What is the effective annual rate? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)

b. What is the effective annual interest rate? (Use the monthly rate computed in part (a) rounded to 2 decimal places when expressed as a percent. Enter your answer as a percent rounded to 2 decimal places.)

c. If the monthly interest rate is .75%, what monthly annuity payment can the firm offer to the retiring professor? (Do not round intermediate calculations. Round your answer to 2 decimal places.)

Effective Annual Rate:

Interest rates on loans are often quoted in terms of annual percentage rate, e.g., credit card interest rates. The annual percentage rate is a nominal interest rate that does not account for compounding of interest, and hence will understate the true borrowing cost.

Answer and Explanation: 1

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a. The monthly interest rate is 0.21%.

Denote the monthly interest rate by r. At this interest rate, the present value of the payment is equal to the...

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How to Find the Value of an Annuity

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Chapter 21 / Lesson 15
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An annuity is a type of savings account that pays back the investor in the future. Learn the formula used to calculate an annuity's value, and understand the importance of labeling specific numbers to calculate an output over time.


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