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If 20 articles cost ₹ 90, then the cost of 9 articles is?

₹ 45
₹ 40.50
₹ 4.50
None of these

Correct Answer: ₹ 40.50

Explanation:

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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