Answer:
Market Price $985.01
Explanation:
We have to convert the US semiannually rate to annually.

Now this is the annual rate spected for a similar US Bonds
So we are going to calculate the present value using this rate.
Present value of an annuity of 78 for 20 years at 7.9521%


PV = 768.55
And we need to add the present value ofthe 1,000 euros at this rate


Present Value = 216.4602211
Adding those two values together
$985.01
The reasoning behind this is that an american investor will prefer at equal price an US bonds because it compounds interest twice a year over the German Bonds.