Present value = need your help!

[xippie]

As long as the interest rate is greater than zero, will the present value of a single sum always increase as the interest rate increases, be less than the future value, decrease as the period of time decreases, equal the future value if the time period is one year, or increase as the number of periods increases?

[rampart]

Here is a good explanation:

http://www.moneychimp.com/articles/finworks/fmpresval.htm