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Math Help - Consumer math

  1. #1
    Member
    Joined
    Sep 2009
    Posts
    145

    Consumer math

    Hi,

    I'm not sure of these and need them checked, kindly. Alternatives would be appreciated also :-)

    a.) A man sold a car for $22 000 and gained 10% on his money. How much did he pay for the car?

    M => Amount paid for car
    100 \% + 10 \ % = 110 \% (Since it's a gain, we add?)

    110 \% \times \rm{M} = 22 000

    \rm{M} = 22 000 \div 110 \%

    \rm{M} = \$20 000

    b.) An electric iron was bought for $150 and sold for a profit 10%. What was the selling price?

    100 \% + 10 \ % = 110 \%
    110 \% \times 150 = 165
    I got this one after trial and error. My answer just coincides with the given. I don't see the reason for multiplying 1.1 by 150.

    c.) In a sale the price of a pair of shoes was reduced by 33 \frac13 \%. The sale price was $30. What was the original price?

    Original Price = Unknown (g)
    Sale Price (Final Price) = $30

    Loss % = 33 \frac13\
    33 \frac13 \% = \frac13

    Relating these is the problem I'm having: g - \frac13 = \$30
    \frac{2}{3}g = 30
    g = 45
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  2. #2
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    Joined
    Mar 2011
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    6

    Re: Consumer math

    They're correct...
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  3. #3
    Member
    Joined
    Sep 2009
    Posts
    145

    Re: Consumer math

    Yeah, thanks.
    I don't understand the second problem (b.), as I noted in my original post. Would be glad if someone could clear it up, please!
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