Annuities, Sinking Funds, and Amortization
Math Analysis and Discrete Math – Sections 5.3 and 5.4
I. Warm-Up Problem
Previously, we have computed the future value of an investment when a fixed amount of money is deposited in an account that pays interest compounded periodically. Often, however, people do not deposit money and then sit back and watch it grow. Rather, money is invested in small amounts at periodic intervals. Consider these problems: 1. Chrissy deposits $200 each year into a savings account that has an annual interest rate of 8% compounded annually. How much money will Chrissy have in her account after three years? Hint: Make up a table of how much she has in her account by year.
2.
Ben saves $50 per month in a credit
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Problem 3: Paying off Bonds The state has $5,000,000 worth of bonds that are due in 20 years. A sinking fund is established to pay off the debt. If the state can earn 10% annual interest compounded annually, what is the annual sinking fund deposit needed?
Problem 4: Managing a Condo The Crown Colony Association is required by law to set aside funds to replace its roof. It is estimated that the roof will need to be replaced in 20 years at a cost of $180,000. The condo can invest in treasuries yielding 6% paid semiannually. If the condo invests in the treasuries, what semiannual payment is required to have the funds to replace the roof in 20 years?
***Problem 5: Time Needed for a Million Dollars If Josh deposits $10,000 every year in an account paying 8% compounded annually, how long will it take him to accumulate $1,000,000?
Homework: 5.3: #1-25 every other odd, 35-36
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V. Present Value of an Annuity
Definition: The present value of an annuity is the amount of money needed now so that if it is invested at i percent, n equal dollar amounts can be withdrawn without any money left over. Problem: College Tuition Jessica's parents will be paying her college tuition of $20,000 per year for 4 years. If they currently have the money invested at 6% compounded annually, how much money do they need to have in the account to pay the tuition? (Assume that "now" is the beginning of the year and the payment will be made at the
What annual interest rate is needed to produce $200,000 after five years if only $100,000 is invested?
10. An investment of $1,000 today will grow to $1,100 in one year. What is the continuously compounded rate of return?
21. If you invested $100,000 in a one year certificate of deposit that pays 5% interest compounded semiannually, what would be your balance after one year (rounded)?
2. (Q. 6 in B) What is the present value of a four-year annuity of $100 per year
1. What is the present value of a 10-year, pure discount bond paying $1,000 at maturity if the appropriate interest rate is:
If the interest rate on this investment is eight percent, what is the approximate current value of these future payments? (Points : 3)
How much money should be deposited in a bank paying a yearly interest rate of 6% compounded monthly so that after 3 years the accumulated amount will be $20,000?
11. Starting today, Sandy sets aside $10,000 at the beginning of each year into a bank account that pays an annual effective interest rate of 5.5%. She makes 25 such deposits. Thirty years from today, Sandy uses the accumulated value in the account to purchase an annuity that pays $X at the beginning of each year for 25 years. Determine X.
Therefore, if Joe continues to invest $5,000 annually ($416.67 monthly) into his saving account for the next 25 years, his investment, assuming a current balance of $5,000 compounded daily at 0.01% (as currently being offered by WellsFargo), will amount to about $130,170 . Now, Joe has also invested in certificate of deposits (CDs). He reported as simply been reinvesting his original $5,000 for the past six years. Assuming a stated 0.30% interest rate on a two year CD with daily compounding, his $5,000 investment is now worth about $5,091 . However, he seeks to reinvest this until retirement. Performing similar calculations, we obtain a grand total of $5,488 . This is what his CD invest would amount to if he were to reinvest the current $5,091 at a 0.30% interest rate with daily compounding for the next 25 years.
We wish to compute the present value. The present value is the dollar amount which, if invested at r percent compounded annually, would grow to an amount C after n years.
As you increase the length of time involved, what happen to the present value of an annuity? What happens to the future value?
A sum of $ 5000 is invested at a compound interest rate of 6.3 % per annum. (a) Write down an expression for the value of the investment after n full years.
This section reviews basic time value of money calculations. The concepts of future value, present value and the compounding of interest are dened and discussed.