Answer:
10.70%
Step-by-step explanation:
In this question, we use the RATE formula that is shown in the attachment
Data provided in the question 
Present value = $913.89
Assuming figure - Future value or Face value = $1,000 
PMT = 1,000 × 8% ÷ 2 = $40 
NPER = 4 years × 2 = 8 years 
The formula is shown below: 
= Rate(NPER,PMT,-PV,FV,type) 
The present value come in negative 
After solving this, the yield to maturity is 10.70%