Answer:
33.8%
Step-by-step explanation:
Purchase price of the bond will be computed using the formula below.

where A = annual coupon = 10% * 1000 = 100
r = yield to maturity = 0.1384
n = time to maturity = 20 years
F = face value = $1,000
p = price of the bond.

Therefore, if Janet sold the bond a year later for $994.79,
the profit on sale =

= 33.8% profit (rate of return).