Principles of Finance, 6e
Besley/Brigham
Chapter 09
POINTS:
1
DIFFICULTY:
Hard
TOPICS:
perpetuity, and at the end of time period 10 you will receive the first payment on an additional $200 in perpetuity. If you
52. Your mother’s employer offers a tax-deferred retirement plan (a 401-b plan, which was authorized by Congress to
encourage savings) which would permit her to invest, tax-free until she retires, up to 15 percent of her salary. Once you
are out of school (one year from today), she figures she can save $1,000 every 6 months, or $2,000 per year. The
insurance company which manages the retirement fund promises to pay a stated (or simple) rate of 12 percent per year,
but with quarterly compounding. If your mother invests $1,000 each six months, starting six months after you graduate (or
18 months from today), how much will she have 5 years from now, assuming the last payment is made at the end of Year
5? (Hint: She will make a total of 8 payments.)
Cash flow time line: In thousands
Begin by finding the quarterly or periodic rate, which is 12/4 = 3%. Equation solution: A
way to solve the problem is to recognize that we have an 8-period annuity of $1,000 per
period. Note, though, that the effective 6-month interest rate must be used. The effective
annual rate of (1.03)4 − 1 = 12.55%, but that rate cannot be used for the annuity because
the payments are semiannual. What you must do is get the effective 6-month rate, found
as follows: (1.03)2 − 1 = 0.0609 = 6.09%. (Note that (1.0609)2 − 1 = 12.55%.) Calculate
the effective 6-month rate
Calculate the FV of the annuity