Answer :

The pencil is in shape of cylinder.


Let the radius of base be r cm


Circumference of base = 1.5 cm


2πr = 1.5 cm


[As Circumference of circle is 2πr]



Also, Height, h = 25 cm


As we know,


Curved surface area of cylinder = 2πrh


Where r is base radius and h is height



1 cm = 0.1 dm


1 cm2 = 0.01 dm2


37.5 cm2 = 0.375 dm2


Cost for coloring 1 dm2 = Rs. 0.05


Cost for coloring 0.375 dm2 (i.e. 1 pencil) = Rs. 0.01875


Cost for coloring 120000 pencils = 120000 ×0.01875 = Rs. 2250


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