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April 25, 2014

Homework Help: calculus

Posted by zeina on Tuesday, December 28, 2010 at 10:21am.

A cylindrical can is to be made to hold 100cm cubic.The material for its top and bottom cost twice as much per cm square as that for its side.
The objective of this problem is to find the radius and the height of this cylinder such that its cost is minimized.Denote the radius of this can by r and its height by h. Let k be the cost,expressed in cents,of 1 cm square of the side of this can.
1)Express the cost of the side and that two bases in terms of r, h and k.
2)Express the total cost of manufacturing this can in terms of r only.
3)Find r that minimizes the cost.
4)Deduce the corresponding h.

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