Answer:
The cuopon rate is 8%
Explanation:
We are given with the data and need to solve for the rate of the cuopon:
Market value: 1,006.27
Market value = cuopon payment + maturity
Maturity 1,000
time 9
rate 0.079
PV 504.4371 = Maturity value
Market value = cuopon payment + maturity
1,006.27 = cuopon payment + 504.44
1,006.27 - 504.44 = 501.83
The present value of the cuopon payment Using the annuity formula we solve for cuota:

then:
PV $501.83
time 9
rate 0.079
C -$ 80.00
We know that Cuopon payment is equal to:
Face value x bonds interest = C
1,000 x r = 80
r = 80/1,000 = 0.08 = 8%