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  1. If 20 articles cost ₹ 90, then the cost of 9 articles is ?
    1. ₹ 45
    2. ₹ 40.50
    3. ₹ 4.50
    4. None of these
Correct Option: B

Cost of 20 articles = ₹ 90
Cost of 1 article = ₹ 90/20
∴ Cost of 9 article = 9 x 90/20 = ₹ 40.50


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