# Present value of $1 per week Printable View • Nov 13th 2007, 10:21 PM Scuzzie Present value of$1 per week
Hi folks,

I've been desparately trying to work out the underlying formula for the attached table. If someone could assist me in this, I would be grateful.

Thanks
• Nov 14th 2007, 04:25 AM
topsquark
Quote:

Originally Posted by Scuzzie
Hi folks,

I've been desparately trying to work out the underlying formula for the attached table. If someone could assist me in this, I would be grateful.

Thanks

My first thought would be to graph it and see what it looks like. Have you done this yet?

-Dan
• Nov 14th 2007, 09:23 PM
Scuzzie
Hi Dan, no I haven't graphed it because what I need is the underlying equasion for the attached table and then I can adapt it to calc different multiples of weeks and parts thereof.

Present value of $1 a week from now is .9989 which means there is an interest rate of .11% per week. An annuity is the present value of a series of payments. The resulting equation is a series depending on how many weeks you want to sum:$\displaystyle \sum_{k=1}^{n+1} \frac{1}{1.0011^k}\$