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.