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18. The circumference of the base of an open cylinder at the top is 88 cm. Thesum of radius and height is 30 cm. Find the cost of polishing the outersurface area of the cylinder at the rate of Rs. 25 per square decimetre. |
| Answer» 18. The circumference of the base of an open cylinder at the top is 88 cm. Thesum of radius and height is 30 cm. Find the cost of polishing the outersurface area of the cylinder at the rate of Rs. 25 per square decimetre. | |