A rectangular box is to have a square base and a volume of 60 ft. The material for the base costs 44¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top
costs 21¢/ft. Letting x denote the length of one side of the base, find a function in the variable x giving the cost (in dollars) of constructing the box.
f(x)=