Question

find the cost of sinking a tubewell 210m deep ,having radius 1.5m at the rate of rs.3 per cubic meter ..how much will it cost in cementing the inner curved surface at rs.25 per square meter? Answer=rs.4455 , rs.45900

Answer 1

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Answer 2

Cost of sinking the tube well will be - Rs. 4455.

Cost of cementing inner curved surface will be - Rs. 49500.

Volume of tube well will be given by the formula -

π r²h

Given values are -

R = 1.5 m

H = 210 m

Therefore, volume = π * 1.5² * 210

Volume = 1485 m³

Now, cost of sinking at the rate given in question, which is Rs. 3 / m³ will be -

Cost = 3*1485

Cost for sinking tube well = Rs. 4455.

Now, to calculate inner curved surface area, the formula used will be - 2πrh.

Inner curved surface area = 2*π*1.5*210

Inner curved surface area = 1980 m²

Cost of covering inner curved surface given in question is = Rs. 25/m²

Now, cost of covering inner curved surface of tube well will be -

25*1980

Cost of covering inner curved surface of tube well will be -Rs. 49,500.

Thus, cost of sinking tube well is Rs. 4455 and cost of cementing inner surface of tube well is Rs. 49,500.