B. 6.50 percent (C. 7.80 percent D.8.33 percent 8. You have asked a friend to loan you money. She has agreed to do so as long as you agree to pay her 1 percent interest per week. What effective annual rate of interest is she requiring? A. 52.00 percent B. 52.52 percent C. 65.00 percent D. 67.77 percent 9. Last year, T-bills returned 2 percent while your investment in large-company stocks earned an average of 5 percent. Which one of the following terms refers to the difference between these two rates of