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

Given data is as follows:
Height of the tube well = 280 m
Diameter = 3 m
Rate of sinking the tube well = Rs.3.60/
Rate of cementing = Rs.2.50/
Given is the diameter of the tube well which is 3 meters. Therefore,
m
Volume of the tube well =
=
= 1980
Cost of sinking the tube well =
=
= Rs. 7128
Curved surface area =
=
=2640
Cost of cementing =
=
= Rs.6600
Therefore, the total cost of sinking the tube well is Rs.7128 and the total cost of cementing its inner surface is Rs.6600.

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