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    adam_89's Avatar
    adam_89 Posts: 1,866, Reputation: 280
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    #1

    Dec 14, 2009, 11:36 AM
    I have a few questions I don't know how to do.
    Ok, first one:

    To make it simple, a car dealership sells 12 cars one week and then 19 the next week. What is the percentage increase in sales from one week to the next?


    Next question is:

    If r= 5 z then 15 z = 3 y, then r =

    I am confused by this so if someone can help me I would appreciate it.
    adam_89's Avatar
    adam_89 Posts: 1,866, Reputation: 280
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    #2

    Dec 14, 2009, 11:51 AM

    Here is another one that is kind of similar to the first one:

    If a dealer sells a car for $39,000, which represents 25% profit over the cost. What was the cost to the dealer? I know the answer to this but I don't know how to get to it.
    adam_89's Avatar
    adam_89 Posts: 1,866, Reputation: 280
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    #3

    Dec 14, 2009, 01:38 PM

    Anyone have any solutions please?
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
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    #4

    Dec 14, 2009, 03:42 PM

    Ok, #2 is in terms of y right?
    So
    r=5z
    15z=3y
    since 15/5=3 you can substitute 15z for 3r, now
    3r=3y
    divide by 3
    r=y
    now #1
    12 to 19
    the difference is 7 so 7/12 is the answer or 58.3 repeating
    now #3
    the equation is (25% u is 1.25)
    1.25x=39000
    divide by 1.25
    you can do this
    adam_89's Avatar
    adam_89 Posts: 1,866, Reputation: 280
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    #5

    Dec 15, 2009, 05:52 AM

    Ok, that all made very good sense. Thank you very much. I was taking 19/12 at first which gave me 1.58 and I knew the .58 part was right and wasn't sure about the rest.

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