Rolcam, I initially started down the same road you did, but then I noticed that the 'present value' in this case seems to be from the perspective of the
recipient of the payments ("...
with the first payment being received immediately... ").
Volora, note that your problem can be viewed as using a
5% discount rate per
6-month period, and that the 4 payments are received at the end of periods 0, 2, 4, and 6 (corresponding to immediate; end of first year; end of second year; end of third year).
Thus, you can price the cash flow stream with
Equivalently, you can first determine the effective
annual rate (10% per year, semiann compounding, = 10.25%). Then, price the cash flow stream using the familiar 'PV-of-an-annuity' formula--remembering that the first payment is received immediately, while the remaining three payments form an 'ordinary' annuity:
Same result, whichever method you prefer.