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Math Help - Daughters University Fund

  1. #1
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    Question Daughters University Fund

    Your three year old daughter may want to enter university 15 years from now and you've decided to establish a fund to provide for her tuition fees for four (4) years of university education. Tuition is current $1500 per year, however, you anticipate that it will rise by approximately 4% per year between now and when your daughter first enters university. Furthermore, you have assumed that tuition will increase by $150/year in each of the last three years of the four year program. You have also assumed that each year's tuition will be due at the beginning of the year (i.e. first tuition fee due at the end of the 15th year). What equal annual amount will have to be set aside at the end of each of the next 15 years in order to able to fund the expected tuition requirements? Assume you can earn 12%, compounded annually, on your savings.

    My attempt so far,


    Cost of daughters tution for first year,

    F_{1} = 1500(\frac{F_{1}}{P_{1}}, 4\%, 15) = \$2701.42

    second year,

    F_{2} = 2701.42(\frac{F_{2}}{P_{2}}, 4\%, 1) + 150 = \$2959.47

    third year,

    F_{3} = 2959.47(\frac{F_{3}}{P_{3}}, 4\%, 1) + 150 = \$3227.85

    fourth year,

    F_{4} = 3227.85(\frac{F_{4}}{P_{4}}, 4\%, 1) + 150 = \$3506.96

    If I can take the future values of the 2nd, 3rd and 4th year and bring them back to year one I can sum them all and that would be the future value that I need to have by year 15, call it F_{15}.

    Then,

    A = F_{15}(\frac{A}{F_{15}}, 12\%, 15)

    Should give me the value of payment that must be made for 15 years in order to pay my daughters tuition, correct?

    Does anyone see any mistakes in my thought process? Is there a simpler way to arrive at the same solution?

    Thanks again!
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  2. #2
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    Re: Daughters University Fund

    Quote Originally Posted by jegues View Post
    Your three year old daughter may want to enter university 15 years from now and you've decided to establish a fund to provide for her tuition fees for four (4) years of university education. Tuition is current $1500 per year, however, you anticipate that it will rise by approximately 4% per year between now and when your daughter first enters university. Furthermore, you have assumed that tuition will increase by $150/year in each of the last three years of the four year program. You have also assumed that each year's tuition will be due at the beginning of the year (i.e. first tuition fee due at the end of the 15th year). What equal annual amount will have to be set aside at the end of each of the next 15 years in order to able to fund the expected tuition requirements? Assume you can earn 12%, compounded annually, on your savings.

    My attempt so far,


    Cost of daughters tution for first year,

    F_{1} = 1500(\frac{F_{1}}{P_{1}}, 4\%, 15) = \$2701.42
    What does this mean? In particular what does P_1 mean? And what does "(A, percent, number)". What is \frac{F_1}{F_2} mean? is it a fraction or an operator? If an operator, how is it defined?

    second year,

    F_{2} = 2701.42(\frac{F_{2}}{P_{2}}, 4\%, 1) + 150 = \$2959.47

    third year,

    F_{3} = 2959.47(\frac{F_{3}}{P_{3}}, 4\%, 1) + 150 = \$3227.85

    fourth year,

    F_{4} = 3227.85(\frac{F_{4}}{P_{4}}, 4\%, 1) + 150 = \$3506.96

    If I can take the future values of the 2nd, 3rd and 4th year and bring them back to year one I can sum them all and that would be the future value that I need to have by year 15, call it F_{15}.

    Then,

    A = F_{15}(\frac{A}{F_{15}}, 12\%, 15)

    Should give me the value of payment that must be made for 15 years in order to pay my daughters tuition, correct?

    Does anyone see any mistakes in my thought process? Is there a simpler way to arrive at the same solution?

    Thanks again![/QUOTE]
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  3. #3
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    Re: Daughters University Fund

    They are mnemonics for the equations.

    (\frac{F}{P}, 4\%, 15)

    Would be a constant value describing the future value of a present amount given an interest rate of 4% for 15 peroids. If you multiply this constant by the present amount you will have solved for the future value of said present amount.

    Make sense?

    The textbooks hope is so that you don't need to know the formulas for everything you can simply look up a value in the table.
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  4. #4
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    Re: Daughters University Fund

    Quote Originally Posted by jegues View Post
    The textbooks hope is so that you don't need to know the formulas for everything you can simply look up a value in the table.
    And what if you don't have "tables"? Using tables today is like using a horse and buggy !
    This is what "it looks like":
    Code:
    0                                    .00
    1  279.33                         279.33
    2  279.33                35.52    592.18
    ....
    14 279.33               939.51  9,048.11
    15 279.33             1,085.77 10,415.21 ****
    15         -2,701.42            7,711.79
    16         -2,959.47    925.41  5,677.73
    17         -3,227.85    681.33  3,131.21
    18         -3,506.96    375.75       .00
    **** 2701.42 + 2959.47/1.12 + 3227.85/1.12^2 + 3506.96/1.12^3 = 10415.21

    OK?
    Last edited by Wilmer; September 28th 2012 at 12:11 PM.
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