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प्रश्न
Find the cost of sinking a tubewell 280 m deep, having diameter 3 m at the rate of Rs 3.60 per cubic metre. Find also the cost of cementing its inner curved surface at Rs 2.50 per square metre.
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उत्तर
Cost of sinking a tube well = Volume of the tube well x Cost of sinking a tube well per cubic metre
= `22/7` x (1.52) x (280) m3 x Rs 3.6/m3 = Rs 7128.
Cost of cementing = Inner surface area of the tube well x Cost of cementing per square metre = ((2 x `22/7` x 1.5x 280) m2) x Rs 2.5/m2 = Rs 6600
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