A toy is in the form of a cylinder with hemispherical ends.if the whole length of the toys 90cm and its diameter is 42cm,find the cost of painting the toy at the rate of 70 paise per sq. cm.
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Total height of toy = 90cm.
Height of cylinder = 90-(2X21)
= 48cm
Area of cylinder =2pi rh
= 2 pi 21 X 48
= 2016 pi
Area of hemisphere =4 pi r^2
=pi X 21 X 21
= 1764 pi
Total area = 1764 pi + 2016 pi
= pi (1764+2016)
= pi (3780) cm sq.
Cost =3780 X pi X 70
= 8316 rupees.
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