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Math Help - Interest compounded monthly.

  1. #1
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    Interest compounded monthly.

    Hey everyone,
    I hope this is in the right section. Anyway, the problem I have is "a $200,000 loan is to be repaid over 20 years in equal monthly installments, beginning at the end of the first month. Find the monthly payment if the loan is at an annual rate of 9%, compounded monthly." Any help?

    Thanks,
    Peter
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  2. #2
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    <br />
200,000=A(1+\frac{.09}{12})^{12*20}<br />

    Compounded monthly means each month the interest rate is one twelfth the yearly rate. And since you're compounding each month for twenty years, you compound it 12*20 times. Solve for A to find monthly installment.
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  3. #3
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    So then monthly installment would be 33,282? The book says it should be 1799.45.
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  4. #4
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    Quote Originally Posted by flybynight View Post
    So then monthly installment would be 33,282? The book says it should be 1799.45.
    Hmm that number the book gives seems way off unless I'm missing something...
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  5. #5
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    1799.45 is correct.

    P = 200000i / (1 - v)

    i = .09 / 12
    v = 1 / (1 + i)^240

    To financial: you're using present value formula; you need payment formula.
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  6. #6
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    i was web surfing one day and i found this great website that explained financial maths pretty well. it may help you out!

    http://www.weallstartsomewhere.com/finmaths.php
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