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If the coast of banana is increase by 10 RS per dozen, one can get 3 dozen less for 600 RS . Find the original coast of one dozen of bananas.

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  1. Let the cost of banana per dozen be Rs.x.
    Amount for which bananas are bought=Rs.600
    No.of dozens of bananas for Rs.600=600/x
    New cost of banana per dozen=Rs.(x+10)
    New no.of dozens of bananas for Rs.600=600/x+10
    According to given condition,
    600/x-600/x+10=3

    Now you can solve it and after that find x.

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