Answer:
a-1// 8,979.49
a-2// 9613.14
b-1// 5,154.36
b-2// 4,676.51
Explanation:
We will calculate each present value using the formula for present value of an ordinary annuity:
[tex]C \times \frac{1-(1+r)^{-time} }{rate} = PV\\[/tex]
a-1
C 1,025
time 11
rate 0.04
[tex]1025 \times \frac{1-(1+0.04)^{-11} }{0.04} = PV\\[/tex]
PV $8,979.4886
a-2
C 825
time 16
rate 0.04
[tex]825 \times \frac{1-(1+0.04)^{-16} }{0.04} = PV\\[/tex]
PV $9,613.1439
b-1
C 1,025
time 11
rate 0.16
[tex]1025 \times \frac{1-(1+0.16)^{-11} }{0.16} = PV\\[/tex]
PV $5,154.3605
b-2
C 825
time 16
rate 0.16
[tex]825 \times \frac{1-(1+0.16)^{-16} }{0.16} = PV\\[/tex]
PV $4,676.5098