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A factory manufactures 1,20,000 pencils daily. The pencils are cylindrical inshape., each of length 25cm and circumference 1.5cm. Determine the cost of

colouring the curved surface of the penciles manufactured in one day at Rs0.05 per dm².



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Number of pencils manufactured in one day = 1,20,000
1 decimeter(dm) = 10 centimeter(cm)
length = 25cm = (25/10) dm = 2.5 dm
circumference = 1.5cm = (1.5/10) dm = 0.15 dm

curved surface area = circumference × length
                              = 2.5×0.15 dm²
                              =0.375 dm²
curved surface area of all pencils = 0.375×1,20,000 = 45,000 dm²
cost of colouring = Rs. 0.05 per dm²
total cost = 0.05×45,000 = Rs. 2250
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