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Math Help - precent problem

  1. #1
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    precent problem

    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 5% per year, and for the laptop it was 4.5% per year. The total finance charges for one year were $453.75. How much did the desktop computer cost before finance charges?
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  2. #2
    Member Henderson's Avatar
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    Let's say x = price of desktop (before financing).
    Then x-1000 = price of laptop (before financing).

    Multiplying by the finance percentages:

    .05x + .045(x-1000) = 453.75

    I'll let you take it from there.
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  3. #3
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    I'm still having problems with this type of question, It looks similar to eqasions where you set up ex:
    x+y=1000
    30x+40y=300
    then just simply ad (-30) to the uper portion in order to cancel out aether x or y.

    is that what i do here? I'm still lost.

    Here's a similar problem I'm dealing with now:
    A theater group made appearances in two countries. The hotel charges before tax in the second country were $1000 higher than in the first. The tax on the hotel bill was 8% in the first country and 6.5% in the second. After the trip, the total tax paid on accommodation expenses was $608.75 How much was the hotel bill in the first country before tax?
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  4. #4
    GAMMA Mathematics
    colby2152's Avatar
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    then just simply ad (-30) to the uper portion in order to cancel out aether x or y.

    is that what i do here? I'm still lost.
    Yes, multiply the first equation by -30.
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  5. #5
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    x=3425

    that doesnt sound right =/
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