29. Find the cost of sinking a tube-well 280 m deep, having a diameter

1.	29. Find the cost of sinking a tube-well 280 m deep, having a diameter 3 mat the rate or 15 per cubic metre. Find also the cost of cementing itsinner curved surface at 10 per square metre
Answer» Volume of the well=πr^2 h=22/73/23/2280 so cost of sinking a tube well=>22/73/23/228015 =>Rs.29700 now the cost of cementing its inner curved surface area=2πrh10=>222/73/228010 =>Rs.26400

29. Find the cost of sinking a tube-well 280 m deep, having a diameter 3 mat the rate or 15 per cubic metre. Find also the cost of cementing itsinner curved surface at 10 per square metre

Answer»

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*15

=>Rs.29700

now the cost of cementing its inner curved surface

area=2πrh*10=>2*22/7*3/2*280*10

=>Rs.26400