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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Solution

Cost of sinking a tube well = Volume of the tube well $\times$ Cost of sinking a tube well per cubic metre
= 22 x (1.5²) x (280) m³x Rs 3.6/m³ = Rs 7128.
7
Cost of cementing = Inner surface area of the tube well $\times$ Cost of cementing per square metre
= ((2 x 22 x 1.5x 280) m²) x Rs 2.5/m² = Rs 6600
7

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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.

Cost of sinking a tube well = Volume of the tube well × Cost of sinking a tube well per cubic metre = 22 x (1.52) x (280) m3 x Rs 3.6/m3 = Rs 7128. 7 Cost of cementing = Inner surface area of the tube well × Cost of cementing per square metre = ((2 x 22 x 1.5x 280) m2) x Rs 2.5/m2 = Rs 6600 7