2 Assume that you own a building in downtown Laredo that you want to lease for $100,000 per year for five years. The explicit cost of maintaining the building is $20,000, and the implicit cost is $30,000. All revenues are received, and costs borne, at the end of each year. Suppose the interest rate is 4.5 percent. 1. Enunciate the Formula for the Present Value of a Stream [from your textbook] 2. Determine the present value of the stream of your accounting profits. 3. Determine the present value of the stream of your economic profits