In 1975, interest rates were 7.85% and the rate of inflation was 12.3% in the United States. What was the real Interest rate in 1975? How would the purchasing power of your savings have changed over the year? (Note: Be careful not to round any intermediate steps less than six decimal places.) What was the real interest rate in 1975? Real rate of interest in 1975 was %. (Round to two decimal places.) How would the purchasing power of your savings have changed over the year? The purchasing power over that year did the following: (Select the best choice below.) O A. Increased by 3.96% O B. Declined by 3.96% O C. Declined by 4.45% O D. Increased by 4.45%