an owner can lease her building for $150,000 per year for three years. the explicit cost of maintaining the building is $50,000, and the implicit cost is $65,000. all revenues are received, and costs borne, at the end of each year. if the interest rate is 7 percent, determine the present value of the stream of: instructions: do not round intermediate calculations. round your final calculation to two decimal places. a. accounting profits. $ b. economic profits. $