Nitin bought some oranges at $Rs.\, 40$ a dozen and an equal number at $\,30$ a dozen. He sold them at $Rs.\,45$ a dozen and made a profit of $\,480.$ The number of oranges, he bought, was

  • A

    $48$

  • B

    $60$

  • C

    $72$

  • D

    $84$

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