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      Question

      A school bought 45 benches and 55 desks. Average cost of

      a bench is Rs. 1,800 and that of a desk is Rs. 2,700. Find the average cost (in Rs.) of all the benches and desks.
      A Rs.4,200 Correct Answer Incorrect Answer
      B Rs.8,500 Correct Answer Incorrect Answer
      C Rs.2,295 Correct Answer Incorrect Answer
      D Rs.3,230 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Required average = (45 × 1800 + 55 × 2700) ÷ (45 + 55)

      = (81000 + 148500) ÷ 100

      = (229500 ÷ 100) = Rs. 2,295

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