Question

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.

Answer 1

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