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Suppose that a young couple has just had their first baby and they wish to ensure that enough money will be available to pay for their child's college education. They decide to make deposits into an educational savings account on each of their daughter's birthdays, starting with her first birthday. Assume that the educational savings account will return a constant 7% p.a.. The parents deposit $2000 on their daughter's first birthday and plan to increase the size of their deposits by 5% each year. Assuming that the parents have already made the deposit for their daughter's 18th birthday, then the amount available for the daughter's college expenses on her 18th birthday is closest to:a.None of them.b.$67,998.c.$97,331.d.$103,063.e.$42,825.

Question

Suppose that a young couple has just had their first baby and they wish to ensure that enough money will be available to pay for their child's college education. They decide to make deposits into an educational savings account on each of their daughter's birthdays, starting with her first birthday. Assume that the educational savings account will return a constant 7% p.a.. The parents deposit 2000ontheirdaughtersfirstbirthdayandplantoincreasethesizeoftheirdepositsby52000 on their daughter's first birthday and plan to increase the size of their deposits by 5% each year. Assuming that the parents have already made the deposit for their daughter's 18th birthday, then the amount available for the daughter's college expenses on her 18th birthday is closest to:a.None of them.b.67,998.c.97,331.d.97,331.d.103,063.e.$42,825.

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Solution

The correct answer is c. $97,331.

This is a growing annuity problem. The formula for the future value of a growing annuity is:

FV = PMT * [((1 + r)^n - (1 + g)^n) / (r - g)]

where:

  • FV is the future value
  • PMT is the annual payment
  • r is the interest rate
  • n is the number of periods
  • g is the growth rate of the annuity

In this case, PMT = $2000, r = 7% or 0.07, n = 18 years, and g = 5% or 0.05.

Substituting these values into the formula gives:

FV = $2000 * [((1 + 0.07)^18 - (1 + 0.05)^18) / (0.07 - 0.05)]

Calculating this gives a future value of approximately $97,331.

This problem has been solved

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