Question

A factory manufactures 1,20,000 pencils daily. The pencils are cylindrical shape
each of lenght 25 cm and circumference of base as 1.5 cm. Determine the cost of
colouring the curved surfaces of the pencils manufactured in one day at Rs. 0.05
per cm*? ​

Answer 1

1dm^2 = 1cm ^2

The surface area of one pencil = 25x1.5 = 37.5 cm²

the total surface area of pencils made in a day = 37.5 x 120000

= 45000000cm²

= 45,000dm²

The cost of colours = 45,000 x 0.05 = Rs. 2,250

Answer 2

Step-by-step explanation:

surface area of 1 ✏️=2πrh

=2×π×1.5/2×25

=π×37.5

curved surfaces of the pencils=π×37.5×120000

cost=32.5×60000×π=₹2250000