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71. A factory manufactures 120,000 pencils daily The pencils are cylindrical in shape eachof length 25 cm and circumference of base as 1.5 cm. Determine the cost of colouring thecurved surfaces of the pencils manufactured in one day at 0.05 per dm2 |
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Answer» Number of pencils manufactured in one day = 1,20,0001 decimeter(dm) = 10 centimeter(cm)length = 25cm = (25/10) dm = 2.5 dmcircumference = 1.5cm = (1.5/10) dm = 0.15dm curved surface area= circumference× length = 2.5×0.15 dm² =0.375 dm²curved surface area of all pencils = 0.375×1,20,000 = 45,000 dm²cost of colouring = Rs.0.05 per dm²total cost = 0.05×45,000 = Rs. 2250 |
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