00:01
Okay, in this problem, we're going to take a look at a rate of 5 ,000 t .e to the 0 .1t dollars per year that's invested forever at a rate of 6%.
00:11
So our present value that we're trying to analyze here is the integral from zero to infinity of 5 ,000 t, e to the 0 .0 .1t times e to the power of negative 0 .06tdt.
00:28
And before we analyze this improper integral, let's simplify.
00:32
So we have 5 ,000 t .e to the negative 0 .05 tdt.
00:39
The anti -derivative of this one is going to require integration by parts.
00:43
So let's take a look at just this integral of t .e to the negative 0 .055t.
00:51
And we'll deal with 5 ,000 a little bit later.
00:55
So let's let u equal t, which gives us d .e.
00:58
D -t and d -v equal to e to the negative to the power of negative 0 .0 .05t and that gives us v equal to e to the negative 0 .05t divided by negative 0 .05...