The sides of a rectangular field are in the ratio 3 : 4. If the area of the field is 8748 sq. m, the cost of fencing the field @ 25 paise per metre is  Choose the correct choice from the following choices.
A) Rs. 55.50 B) Rs. 67.50 C) Rs. 86.50 D) Rs. 94.50 E) None of these
Solution   Let length = (3x) metres and breadth = (4x) metres.   Then, 3x × 4x = 8748 ⇔ 12x2 = 8748 ⇔ x2 = 729 ⇔ x = 27.   So, length = 81 m and breadth = 108 m.   Perimeter = [2(81 + 108)] m = 378 m.   ∴ Cost of fencing = Rs. (0.25 × 378) = Rs. 94.50. Answer Rs. 94.50
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The sides of a rectangular field are in the ratio 3 : 4. If the area of the field is 8748 sq. m, the cost of fencing the field @ 25 paise per metre is