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    Question

    The inner and outer radii of a circular track are 28 m

    and 25 m, respectively. The cost (in ₹) of levelling the track at ₹28 per m² is: [Use π = 22/7]
    A 15,421 Correct Answer Incorrect Answer
    B 13,992 Correct Answer Incorrect Answer
    C 11,229 Correct Answer Incorrect Answer
    D 17,355 Correct Answer Incorrect Answer

    Solution

    Area outer ​= 22/7 ​ ×28 × 28 = 2464 sq m Area inner = 22/7 × 25 × 25 = 1964.29 sq m Area track = 2464 − 1964.29 = 499.71 sq m ​ Cost = 499.71 × 28 = ₹13,991.88 ≈ 13992

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