00:01
Okay, so we have that a woman has invested $20 ,000 total into two bank accounts.
00:06
So we're going to let x equal dollars in account one, y equal dollars in account two.
00:25
And we know x plus y equals $20 ,000.
00:34
And also, we get an annual interest after one year as $11 ,180.
00:42
And we're going to assume simple interest.
00:44
So simple interest is i equals prt.
00:48
And t is just one year.
00:50
So that's going to be negligible.
00:52
We can just pretend like it's p times r, although this t is just one.
00:56
So that's why we're doing that.
00:57
And our principal amount is however much we've put into account one or account two, because we'll have two interests here and we'll be adding them up together to find that 1 ,180.
01:08
And r is going to be the interest associated with each account.
01:11
So we'll end up getting 0 .05x plus 0 .08y equals $1 ,180...