Suppose that over the past year, the nominal interest rate was 5 percent, the CPI was 150.3 at the end of the year, and the CPI was 144.2 at the beginning of the year. It follows that a. the dollar value of savings increased at 5 percent, and the purchasing power of savings increased at 9.2 percent. b. the dollar value of savings increased at 0.8 percent, and the purchasing power of savings increased at 5 percent. c. the dollar value of savings increased at 5 percent, and the purchasing power of savings increased at 0.8 percent. d. the dollar value of savings increased at 9.2 percent, and the purchasing power of savings increased at 5 percent.