TIMES: when the cash flows are received (1,2,3,... or 2021, 2030, 2032,...).
VALUES: the cash flows (-100, 7, 90*a,...).
INTEREST RATE: 0.1 or 10%.
OBJECTIVE - "I want to find the duration": if the have both the times and the values without any unknown parameter.
OBJECTIVE - "I have the duration, I want to find other stuff":
select it if you have the maturity and you want to find the value at time 5. Then
put in the "duration" the maturity that you have and put in the value at time 5 an "x" or any letter,
because you have to find it.
It will give you the "x" or the letter you put in.