A closed wooden box measures 2 m by 1.5 m by 1 m. What is the cost of painting its entire outer surface at Rs. 18 per square metre?
Correct answer A. Rs. 234
Explanation
TSA = 2(lb + bh + lh) = 2(3 + 1.5 + 2) = 13 sq m. Cost = 13 x 18 = Rs. 234.
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