Given the following cash flows and an interest rate of 5%; 500 600 700 800 900 700 500 300 200 100 y'R 476 544 605 658 705 522 355 203 129 61 tv'Rt 476 1,088 1,815 2,632 3,525 3,132 2,485 1,624 1,161 610 3 4 6 7 8 10 Sum 5,300 4,258 18,548 Find the modified duration. O 3.50 4.60 4.36 O 4.15