Question

In: Finance

Joe can purchase one of two annuities. Annuity 1: A 10 year decreasing annuity immediate with...

Joe can purchase one of two annuities.
Annuity 1: A 10 year decreasing annuity immediate with annual payments
of 10, 9, 8, ..., 2, 1.
Annuity 2: A perpetuity immediate with annual payments: the perpetuity
pays 1 in year 1, 2 in year 2, 3 in year 3, ...., 11 in year 11. After year 11, the
payments remain constant at 11.
At an annual e§ective interest rate of i, the present value of Annuity 2 is
twice the present value of Annuity 1. Calculate the present value of Annuity 1
at this annual e§ective interest rate of i.

Solutions

Expert Solution

We use excel solver to solve the problem

Initially, we assume any random effective interest rate of i ( 5% assumed)

Here, we find the terminal value using the formula = Annuity in year 11 + (Annuity in year 11 /Interest rate)

NPV is found using NPV function in excel => NPV = NPV (Interest rate, All cash-flows)

We input the following constraints in excel solver

Solving we get the Effective interest rate = 9.30% and PV of Annuity 1 = $39.42

Effective interest rate 'i' = 9.30%
NPV $39.42 $78.84
Year
1 10 1
2 9 2
3 8 3
4 7 4
5 6 5
6 5 6
7 4 7
8 3 8
9 2 9
10 1 10
Terminal value at year 11 0 129.2593

Hence, the Present Value of Annuity 1 at the required annual effective interest rate of 9.30% = $39.42


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