13. An 11-year annuity has a series of payments 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1 with the first payment made at the end of the second year and each subsequent payment occurring one year later than the previous. The present value (i.e. value at time 0) of this annuity is 25 using an effective annual interest rate of i A 12-year annuity has a series of payments 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1 with the first payment made at the end of the first year and each subsequent payment occurring one year later than the previouS Find the present value (i.e. value at time 0) of the 12-year annuity at the interest rate i. Give your answer rounded to one decimal place. Note:I found this problem kind of tough, but it can be done