A well has to be dug out that is to be 22.5 m deep and of diameter 7m. Find the cost of plastering the inner… · ABC26GN4892
Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: M.A.T., 2006; M.B.A. 2007
A well has to be dug out that is to be 22.5 m deep and of diameter 7m. Find the cost of plastering the inner curved surface at ₹ 3 per sq. meter.
(a)₹ 1465
(b)₹ 1475
(c)₹ 1485
(d)₹ 1495
Answer
Explanation
Curved surface area $=2 \pi r h=\left(2 \times \frac{22}{7} \times \frac{7}{2} \times 22.5\right) \mathrm{m}^{2}$ $$=495 \mathrm{m}^{2} .$$ ∴ Cost of plastering $=₹(495 \times 3)=₹ 1485$.
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