In my understanding: 10% loan – Payments are made every six months => equivalent of 5% every six months. Loan is paid over 5 years so 10 equal payments. PV of loan at time 0 is $320.000 and we are looking for 10 equal payments (in 10 periods) which include interests. We can treat this as annuity at 5% over 10 periods:
X * 7.722 = $320,000 X = $320,000 / 7.722 X = $41,440