What is the net present value of periodic payments of 10, 20 and 30 currency units with a discount rate of 8.75%. At time zero the costs were paid as 40 currency units.
割引率 8.75% で定期的に 10、20、30 貨幣単位を支払う場合の正味現在価値を求めます。時間 0 のとき、-40 貨幣単位で費用が支払われます。