George Mackay has identified two buildings that are suitable for his new office. For building A, George will have to pay $ 245,000 a year for 10 years, while building B will cost $ 175,000 a year for 15 years. The interest rate on both loans is 9 percent.
A. Which building is less expensive?
B. Which building is less expensive if building A has payments of $ 150,000 for 20 years and the interest rate is 9 percent?