What is the problem?

W: Hello, Oscar—it’s Tanya from the Cardona Museum. Unfortunately our budget’s been cut, so we’ll have to delay some of the renovations we’ve asked you to do.
M: Ah—that’s too bad. Do you know which parts of the project you’d like to put off?
W: Well, I know. We talked about adding a library wing on the west side of the building—but that’s very expensive. So, if we don’t make that addition, that’s all we may need to cut.
M: You know, that’s not a bad idea. Let’s see how much you’d save if I take the library out of the renovation proposal. I’ll e-mail you a revised estimate this afternoon.
56.What is the problem?
57.Which part of the renovations will likely be postponed?
58.What does the man mean when he says, "that’s not a bad idea"?