math of investment

An article cost $29885. To buy this article, a down payment of $3420 is needed.If interest charged is 16% compunded quarterly, how much should be paid at the end of every 3 months for 1 year in order to payoff the balance?

please explain,i don't understand...thank you very much

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asked by Icy
  1. This is what is called an amortization problem. It is usually solved with a table or an iterating program. Here is a way to get the approximate answer directly. The principal due at the beginning is 29885-3420 = $26465. Over one year, with a declining balance, the average balance is $13232 and the interest on that amount over one year will be $2117.
    It the loan is paid off in equal quarterly amounts, they must add up to 26465 + 2117 = $28582. The quarterly paymewnts should be 1/4 of that, or $7146.

    Check:
    Balance due at start (after down payment):
    26465
    After one quarter: add 1058.60 for interest due and subtract 7146 principal payment. Remaining balance = 20,377.60
    After first quarter: add $815.10 interest and subract 7146 principl. Remaining balance = 14,046.70
    After third quarter: add 561.87 interest and subtract 7146. Remaining balance = $7462.57
    After fourth quarter: add $298.50 interest and subtract 7146. Remaining balance = $615.

    For a second iteration, I would recommend adding $154 to each quarterly ayment, to get rid of the $615 deficit on the first attempt.

    That makes the quarterly payment $7300 after one iteration. I end up overpaying $38 this way, so the third iterated answer is $10 less per quarter, or $7290.

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    posted by drwls
  2. There is a handy amortization calculator at this web site:
    http://www.yona.com/loan/

    Enter the initial loan balance of 26465, the 16$ interest rate, and 4 quarterly payments.

    Using it, with quarterly compounding you should get an exact loan payment of $7290.84

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    posted by drwls
  3. 27523.60

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    posted by tin
  4. 9765.25

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    posted by vincent

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