Question

The outer curved surface of pencil having a diameter 7 mm and length 20 cm is coated with fine material .find the amount spent on coating 1000 packets of pencils ,each packet containing 10 pencils at the rate of ₹400 per sq.m .​

Answer 1

Answer:

So, diameter =7 mm or 0.7cm

= radius = diameter ÷2

=(7/10 ×1/2) cm= radius

= Area of cylinder =2pi×r×h

=(2×314/100×7/20×20) cm^2= area

=43.96cm^2= area

so, total cost for 1 pencil =₹(.4396×400)

=₹175.84 is the cost for 1 pencil

= for 10 pencils or a packet will cost ₹(175.84×10)

=₹1758.4 for 1 packet

=for 1000 packets it I'll require ₹(1758.4×1000)

so 1000 packets will cost ₹1758400.

Answer 2

Answer:

answer for the given problem is given