Questions 1, a-c, all refer to the same annuity of 100 annual payments where each payment is $1.. (2 points each Part). I need to see both your formula and the value. a. What is the Present value at t=0 of this annuity if the interest rate assumption is 6% for the first 50 years and is 7% for the last 50 years and the first payment is one year from today.. b. What is the Present value at t=0 of the same annuity if the interest rate assumption is 4% for all years and the first payment is 15 months from today.. C. What is the Present value at t=0 of the same annuity if the interest rate assumption is 6% convertible monthly for the first 50 years from today and is 4% convertible monthly after that and the first payment is 2 years from today