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Math Help - word problem question

  1. #1
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    word problem question

    how did he found out that 90 was a 30% mark up of 300??????
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  2. #2
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    Re: word problem question

    let P = price paid for the phone

    1.3P = 390

    P = 300

    let S = selling price

    S = 0.8P = 0.8(300) = 240
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  3. #3
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    Re: word problem question

    how did you get 1.3?
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    Re: word problem question

    Quote Originally Posted by asilvester635 View Post
    how did you get 1.3?
    a 30% markup is 130% of the original price = 1.3 times the original price
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  5. #5
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    Re: word problem question

    Let the original price = $100, 30% high means marked price = $130
    When marked price = $130 original price = $100
    When marked price = $1 original price = $100/130
    When marked price = $390 original price = $(100/130) x 390 = $300
    Now he has to sell it for 20% less. 20% of 300 = 20 x 300 x 1/100 = $60
    So he will get $240 for cellphone
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