# force of interest integral

• Oct 3rd 2008, 09:56 AM
actsci231
force of interest integral
How much is 500 at time 1 worth at time 11. Assume that http://mapleta-mef.math.uwaterloo.ca...pcmggfbdie.gif

i cant solve this anyone help me, thanks
• Oct 3rd 2008, 10:53 AM
TKHunny
Quote:

Originally Posted by actsci231
How much is 500 at time 1 worth at time 11. Assume that http://mapleta-mef.math.uwaterloo.ca...pcmggfbdie.gif

i cant solve this anyone help me, thanks

No one can solve it without a clue as to the force of interest. Your "assume that" doesn't seem to be followed by much.
• Oct 3rd 2008, 11:01 AM
actsci231
but dont u anti derivavtive the force of interest formula to get a(t), u are also given the time which is 1 and 11 years
• Oct 3rd 2008, 11:29 AM
TKHunny
1) No, you don't "anti derivative" anything, since that isn't a verb. It requires an integral.

2) I cannot see the gif you attempted to display. Can you write it out?
• Oct 3rd 2008, 11:37 AM
actsci231
force of interest = 0.0245(1 - 0.007 t) ^(-1)
• Oct 3rd 2008, 01:55 PM
TKHunny
Well, there you go...

$\displaystyle \int_{0}^{11}\left(\frac{0.0245}{1-0.007t}\right)\;dt = A$

$\displaystyle 500 \cdot e^{A}\;=\; ??$

Why are you struggling with this? Do you have enough calculus background to handle the integral? Better brush up.

Note: You should also work on using whole words and complete sentences. That WILL improve your presentation.
• Oct 4th 2008, 06:25 AM
TKHunny
Odd. I can now see the gif. It must be a firewall thing on my other PC.