So it'll be a function of x and height for now. So let's write h as the height right over here. So what is the cost of this container going to be? So the cost is going to be equal to the cost of the base. Well, the cost of the base is going to be $10 times, I'll just write 10. It's just going to be 10 times the area of the base. Well, what's the area of the base?