You should utilize the method of annuity which marked "PMT", since it is paid in equal amount of money constantly through years.
Assuming the value of the future value "FV" of this annuity offer is known. Then, you should utilize the formular of the present value of an annuity.
where having "i" as interest rate and "PV" as present value
Assuming you are asking for the fature value of this annuity offer and the present value which is called the par value or face value of writing is known.
You should utilize the formular of the future value of an annuity.