Answer:
market rate falls to 7%
market price of bonds after 2 years:
PV of face value = $1,000 / 1.07⁸ = $582.01
PV of coupon payments = $120 x 5.9713 (PV annuity factor, 7%, 8 periods) = $716.56
market price = $1,298.57
market price of bonds after 3 years:
PV of face value = $1,000 / 1.07⁷ = $622.75
PV of coupon payments = $120 x 5.3893 (PV annuity factor, 7%, 7 periods) = $646.72
market price = $1,269.47
market rate increases to 13%
market price of bonds after 2 years:
PV of face value = $1,000 / 1.13⁸ = $376.16
PV of coupon payments = $120 x 4.7988 (PV annuity factor, 13%, 8 periods) = $575.86
market price = $952.02
market price of bonds after 3 years:
PV of face value = $1,000 / 1.13⁷ = $425.06
PV of coupon payments = $120 x 4.4226 (PV annuity factor, 13%, 7 periods) = $530.71
market price = $955.77