An owner can lease her building for $140,000per year for three years. The explicit cost of maintaining the building is $45,000, and the implicit cost is $60,000. All revenues are received, and costs borne, at the end of each year. If the interest rate is 4 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.

$