You want a function for cost.
Where the cost of the side is 3.5 and the ends .65 (to account for only one base at 1.30)
Plug in for V, finish calculating r, get your dimensions.
I really don't know how to do the following problem:
A conical bin must have a volume of 2500 ft3. The circular base is made of a concrete slab, which will cost $1.30 per square foot, and the material for the side costs $3.50 per square foot. Find the dimensions that minimize the total cost.
I am in an introductory math course and he said to solve this using calculus... how do I start? Am I supposed to take the floor cost multiplied by the side cost? If anyone could give me some helpful hints or the correct answer, I'd really appreciate it. Thanks.