Compound Interest : Future Value and Present Value

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Payments of $1800 and $2400 weere made on a $10,000 variable-rate loan 18 and 30 months after the date of the loan. The interest rate was 11.5% compounded semi-annually for the first two years and 10.74% compounded monthly thereafter. What amount was owed on the loan after three years?

  • Compound Interest : Future Value and Present Value -

    make a 'time-graph' and label points 0,(now), 18,24 (the rate changes here), 30, and 36.

    place 10000 at 0
    1800 at 18 and 2400 at 30

    you want to bring all three money values up to time-point 36

    the 1800 is charged a rate of .115/12 for 6 months and then .1074/12 for the next 12 months.
    its value at 36 = 1800(1+.115/12)^6(1+.1074/12)^12
    = $2121.10

    the 2400 is charged .1074/12 for 6 months
    its value is 2400(1+.1074/12)^6
    = $2531.80

    The original debt at 36 has a value of
    10000(1+.115/12)^24(1+.1074/12)^12
    = 13990.97

    so the amount owing is
    13990.97 - 2531.80 - 2121.10
    = 9338.07

    (please check my arithmetic)

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