Q. 54.4( 31 Votes )

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Answer :

The figure is shown below:


Given that, diameter(d) of cylinder is 1.4 m and length(h) is 8 m.


the radius of sphere(r) = radius of cylinder



surface area of tank = surface area of cylinder + 2(surface


Area of hemisphere)


= 2πrh + 2(2πr2)


= 2πr(h + 2r)




= 41.36 m2


the cost of painting it on the outside at rate of D20 per m2


= 41.36 × 20


= D827.20


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