Please help me try and solve this precalc problem. it has a few parts and i can't get through any of them so any help is great help!!

So here is the given: The area, = f(s) ft^2, of a square wooden deck is a function of the side (s) feet. A can of stain costs $29.50 and covers 200 square feet of wood.

1. what is the formula for f(s)?
2. find a formula for c=g(A), the cost in dollars of staining an area of A ft^2
3. find and interpret C=g(f(s))
4. Evaluate and interpret:
a. f(8) b. g(80) c. g(f(10))

ALL and ANY help is GREATLY appreciated. THanks in advance!