Answer:
real rate of return = 4.77%
Explanation:
you purchased the bond at $810 with 14 years to maturity
now, 1 year later the bond's price is:
market value = $797.50
total nominal returns = $80 (coupon payment) + ($797.50 - $810) = $67.50
the real rate of return = {[1 + ($67.50/$810)] / (1 + 3.4%)} - 1 = 4.77%