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Math Help - Profits and Money Questions

  1. #1
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    Mar 2010
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    13

    Profits and Money Questions

    John bought a laptop, a mobile phone and an ipod at a charity auction.
    He later sold all the items for 207.40 making a 22% profit.

    I) What was the total ammount John paid for the 3 items?
    ii) John sold the laptop, which costs 80, at a profit of 45%.
    Find the selling price John sold the laptop.
    iii) John sold the mobile phone, which costs 40 for 26.40
    Express the profit which John made on the ipod as a percentage of the price he paid for it.

    My Answers (really not confident)
    i) 161.772
    ii)116
    iii) 55.6%
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  2. #2
    Super Member Quacky's Avatar
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    Windsor, South-East England
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    Hey,

    1) As he made a 22% profit, the total amount he sold them for was 122%.

    122%=1.22

    Now if you let the price he bought the items for be x:

    x\times1.22=207.4
    How would you rearrange this formula to find x?

    2) You are correct as the profit = 1.45\times80

    3) Using the updated answer for a, have another attempt at c. I'll review your answer afterwards
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  3. #3
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    Ah I see what I did, I followed along with my new answer for a , 170,
    and did this:
    116 + 26.40 = 142.2,
    207.4 - 142.4 = 65
    170 - (80 + 40) = 50
    65 - 50 = 15, 15/50 = 30%
    Is this right?
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  4. #4
    Super Member Quacky's Avatar
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    Looks right to me
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