Answer:
Price at issuance is $1,000 for both bonds.
Price of the 5 year bond after the market rate increased to 7.4% is:
PV of face value = $1,000 / (1 + 3.7%)⁸ = $747.77
PV of coupon payments = $27.50 x 6.81694 (PV annuity factor, 3.7%, 8 periods) = $187.47
Market price = $935.24
this bond's price decreased by 64.76/1,000 = 0.06476 = 6.48%
Price of the 10 year bond after the market rate increased to 7.4% is:
PV of face value = $1,000 / (1 + 3.7%)¹⁸ = $519.97
PV of coupon payments = $27.50 x 12.97365 (PV annuity factor, 3.7%, 18 periods) = $356.78
Market price = $876.75
this bond's price decreased by 123.25/1,000 = 0.12325 = 12.33%