We are minimizing our cost. And so if we go back to the question, the only thing that we have to do now, we know the x value that minimizes our cost. We now have to find the cost of the material for the cheapest container. So we just have to figure out what our cost is. And we already know what our cost is as a function of x. So we just have to put 1.65 into this equation, evaluate the function at 1.65. So let's do that.