Answer:
$36,000
Step-by-step explanation:
Calculation for the amount to be paid to the bondholders for each semiannual interest payment 
Using this formula 
Semiannual interest payment = Face value Amount*Interest Rate*Time
Let plug in the formula 
Semiannual interest payment = $720,000*0.10*0.50
Semiannual interest payment = $36,000
The amount paid to the bondholders for each semiannual interest payment is $36,000