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Math Help - Two problem sums

  1. #1
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    Question Two problem sums

    1.BY selling a Coat for $630, a shopkeeper gains 5%.find the cost price of coat

    2.Paul Bought a car for $960 and sold it to David at a profit of 5%.David Sold it to Tommy at a profit of 10%.Find The money paid by Tommy for the car
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  2. #2
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    I am in 7th grade.i cant do it & i have to show it tommorow
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  3. #3
    Grand Panjandrum
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    If I sell something for n% profit, and I bought it for $x and sold for $y then

    \frac{y-x}{x}=\frac{n}{100},

    which may be rearranged to give:

    y=x(1+\frac{n}{100}).

    Quote Originally Posted by shaurya
    1.BY selling a Coat for $630, a shopkeeper gains 5%.find the cost price of coat
    If the shop keaper gains 5% that means s/he is selling for 1.05 times what
    s/he paid for it.

    So if x is the buying price:

    630=1.05 \times x,

    so:

    x=630/1.05

    2.Paul Bought a car for $960 and sold it to David at a profit of 5%.David Sold it to Tommy at a profit of 10%.Find The money paid by Tommy for the car
    Paul sold for:

    960\times 1.05

    David sold it for what he paid times 1.10 so he sold it for:

    960\times 1.05 \times 1.10,

    which is what tommy paid for it.

    RonL
    Last edited by CaptainBlack; December 30th 2005 at 05:40 AM.
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  4. #4
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    thnx
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