27. You need $23,000 at the end of 7 years, and your only investment outlet is a 9 percent long-term certificate of deposit (compounded annually). With the certificate of deposit, you make an initial investment at the beginning of the first year. a. What single payment could be made at the beginning of the first year to achieve this objective? b. What amount could you invest at the end of each year annually for 7 years to achieve this same objective? If you owe $30,000 at the end of seven years, how much should your creditor accept in payment immediately if she could earn 11 percent on her money