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  1. If cost of 12 pens is ₹ 84, then what is the cost of 10 such pens ?
    1. ₹ 90
    2. ₹ 72
    3. ₹ 65
    4. ₹ 70
Correct Option: D

∵ 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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