Question

51. A factory manufactures 120000 pencils daily. The pencils are cylindrical in shape each of
length 25 cm and circumference of base as 1.5 cm. Determine the cost of colouring the
curved surface of the pencils manufactured in one day at Rs 0.05 per cm?.​

Answer 1

Step-by-step explanation:

lateral surface area = 2πrh

= 1.5cm× 25cm( circumference= 2πr)

= 37.5 cm²

now, cost of coloring one pencil = 37.5 cm² × rs. 0.05/ cm²

= rs. 1.875

so cost of colouring 120000 pencil = 1.875 × 120000

= Rs. 225000

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