Exercise refer to the function f (r), which gives the cost (in cents) of constructing a 10...

Exercise refer to the function f (r), which gives the cost (in cents) of constructing a 100-cubic-inch cylinder of radius r inches.

The graph of f (r) is shown in Fig. 1.

Figure 1

Interpret the fact that the point (3, 162) is the lowest point on the graph of the function. What does this say in terms of cost versus radius?