Final answer:
Joe and June need to calculate annual payments combining future value of annuity and compound interest formulas to meet the expected tuition costs at Joe's alma mater for David's college education considering tuition increases and investment growth.
Step-by-step explanation:
Joe and June need to make annual payments into a college fund that will grow to meet the rising tuition costs by the time their son, David, goes to college. The tuition for Joe's alma mater is currently $20,000 and is expected to increase by 4% annually. To compute the required annual payment, we will use the future value of an annuity formula for the payments and the compound interest formula for the initial $5,000 investment.
To solve this calculation, we need to determine the future value of the $5,000 at an 8% interest rate over 16 years, the future value of the annuity that represents the annual payments at 8% over 15 years, and the present value of the tuition costs, increasing at 4% annually over four years starting from the 16th year.
This problem assumes continuous growth and does not account for variability or risk, such as the investment earning a different return or tuition increases fluctuating. Such assumptions are typical in financial planning to provide an estimate of the savings needed.