• ₹ 90

  • ₹ 72

  • ₹ 65

  • ₹ 70


∵ Cost of 12 pens = ₹ 84 Cost of 1 pen = ₹ 84/12 ∴ Cost of 10 pens = (84/12) x 10 = 7 x 10 = ₹ 70

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