Question

manufactured in one day at 0.05 per
dm
5. A factory manufactures 1,20,000 pencils daily.
The pencils are cylindrical in shape, each of length
25 cm and circumference 1.5 cm. Determine the
cost of colouring the curved surfaces of the pencils​

Answer 1

Answer:

0.1875

Explanation:

to find the surface area we have to multiply the length and circumference .Then we will convert  cm into dm

Answer 2

For the cylindrical pencil, length = 25cm, circumference = 1.5cm

CSA of a pencil = Circumference × Length = 1.5cm ×25cm = $\sf{{37.5cm}^{2}}$

Total CSA of 120000 pencils = $\sf{37.5 × {120000cm}^{2} = {4500000cm}^{2}}$

cost of colouring $\sf{{1cm}^{2}}$ Or $\sf{{100cm}^{2}}$of the curved surface of pencils = Rs. 0.05

Cost of colouring $\sf{{4500000cm}^{2}}$ of the curved surface of pencils = $\sf{Rs. \frac{0.05}{100}×4500000}$

$\longrightarrow$ $\sf{Rs.2250}$