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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