The volume of cylinder 108 cm and the area of its base is 36cm sq .Then height of the cylinder is
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radius of the cylinder =r
1
=18cm
height of the cylinder h=72cm
total surface area
= curved surface are of the cylinder + surface areas of hemispherical ends
=(2πrh+2×2πr
2
)cm
2
=(2πrh+4πr
2
)cm
2
=2πr(h+2r)cm
2
=2×
7
22
×18×(72+36)cm
2
=12219.42cm
2
Rate of polishing 7 paise per sq.cm
Cost of polishing =Rs.(12219.42×
100
7
)
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