Calculation of present value factor

PVF or Present Value Factor is Calculated as (1+r)^-n or 1/(1+r)^n.

wher r is rate of interest and n is number of periods.

^ sign is for power i.e., 2^2=4 or 5^2=25

Agree with Aakash above.

For solving sums, do 1/(1+Interest Rate%) on calculator.

ex. if interest rate is 10%, do "1/1.10" for 1st year. that will give you PVF as 0.909

and afterwords just keep pressing "=" for subsequents years PVF. which will give you 0.826 for 2nd year, 0.757 for 3rd year and so on

PVF on the basis of discount factor. 0.95681877,  0.91909895, 0.88486358.
=1/0.95681877

=104.51311676194953333325669038104-100

=4.5131% discounting factor

I agree with P Y S V S VARMA.