5-58. The high-tech home of today features computer apps that control air conditioning, heating, and large and small appliances from your smartphone or tablet. For a typical 2,000-square-foot home, the estimated benefits of a certain high-tech home is $2,000 per year. (5.8)

a. If a payback period of five years (or better) is desirable, how much can be justified for the installation of these apps?

b. When N = 5 years, what is the internal rate of return?