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(2πr^{2)}

= 2πr(h + 2r)

= 41.36 m^{2}

⇒ ∴ the cost of painting it on the outside at rate of D20 per m^{2}

= 41.36 × 20

= D827.20

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