In a factory, 5000 pencils are manufactured daily. The pencils are cylindrical in shape
having length 25 cm and circumference of base as
1.5 cm. Find the cost of colouring the curved surfaces of the pencils manufactured in
one day at the rate of 50 paise per cm2.use pie 22/7
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Answer:
circumference = 2 pi r = 1.5 cm
height = 25 cm
CSA of cylinder = 2 pi r h
= 1.5 x 25
= 37.5 cm²
rate of painting = rupees 0.5/ cm²
cost= rate x area
=37.5 x 0.5
=18.75 rupees
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