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Discussion :: Decimal Fraction

  1. The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y ?

    2. A.

    2010
    B.

    2011
    C.

    2012
    D.
    2013

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    Answer : Option B

    Explanation :

    Suppose commodity X will cost 40 paise more than Y after z years.

     

    Then, (4.20 + 0.40z) - (6.30 + 0.15z) = 0.40

     

     0.25z = 0.40 + 2.10

     

     z =\(\frac { 2.50} { 0.25 }\)=\(\frac { 250} { 25 }\)=10

     

     X will cost 40 paise more than Y 10 years after 2001 i.e., 2011.

     

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