Answer:
=E7*C2/2
Explanation:
The interest expense will be the carrying value of the bond times the effective interest rate.
On cell C8 we have the interest expense
On E7 we have the carrying value which is the outstanding balance.
Then, on C2 we got the effective rate
As this is an annual formula, we must divide by two to convert to semiannual rate.
A file is attached for how the excel sheet looks like