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2014-10-29T11:50:35+05:30

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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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