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If the cost of 3 books is Rs 90, then find the cost of 12 books. (i) Rs 300 (ii) Rs 320 (iii) Rs 360 (iv) Rs 400

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If the cost of 3 books is Rs 90, then find the cost of 12 books. 

(i) Rs 300 

(ii) Rs 320 

(iii) Rs 360

(iv) Rs 400

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Answer is (iii) Rs 360

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