Question

Find the cost of sinking a tubewell 280 m deep having diameter 3 m at the rate of Rs 360 per cubic meter. Find also this cost of cementing it inner curved surface area of Rs 2.50per square meter​

Answer 1

volume of the well=πr^2 h=22/7*3/2*3/2*280

so cost of sinking a tube well=>22/7*3/2*3/2*280*3.60=>Rs.7128

now the cost of cementing its inner curved surface area=2πrh*2.50=>2*22/7*3/2*280*2.50=>Rs.660