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Math Help - Finance Charges and Computers! Help!

  1. #1
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    Finance Charges and Computers! Help!

    Bob bought two computers, one desktop and one laptop. Before finance charges, the laptop cost $1000 less than the desktop. Bob paid for the computers using two different financing plans. For the desktop the interest rate was 6% per year, and for the laptop it was 9.5% per year. The total finance charges for one year were $641.25 . How much did the desktop computer cost before finance charges?


    I have no idea where to start. Anyone care to guide me through this?
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  2. #2
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    Quote Originally Posted by eraser851 View Post
    Bob bought two computers, one desktop and one laptop. Before finance charges, the laptop cost $1000 less than the desktop. Bob paid for the computers using two different financing plans. For the desktop the interest rate was 6% per year, and for the laptop it was 9.5% per year. The total finance charges for one year were $641.25 . How much did the desktop computer cost before finance charges?


    I have no idea where to start. Anyone care to guide me through this?
    Let l be the cost of the laptop and d the cost of the desk top, then:

    d-l=1000

    and the finance charges were:

    0.06~d+0.095~l=641.25

    Now solve the simultaneous equations.

    RonL
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