What are the interest payments at a yearly interest rate of 5.5 %, a monthly payment period for 2 years and a current cash value of 5,000 currency units? The start period is the 4th and the end period is the 6th. The payment is due at the beginning of each period.
5.5% の期間利率で現在価格 5000 貨幣単位から 2 年間に得られる利息の合計を求めます。計算期間の始まりは第 4 期で、終わりが第 6 期、支払期日は各期間の期首とします。