00:01
At age 19, someone sets up an ira account with an apr of 6%.
00:06
So that's 6 % per year.
00:08
He deposits $90 in the account each month.
00:12
So how much is he going to get at age 65? how much is going to be in the account at age 65? so the formula we're going to use is b, our balance, is our deposit times 1 plus r to the t minus 1 over r.
00:29
So we're looking for a balance.
00:31
He's going to deposit $90.
00:34
So b equals $90, and we're going to go $1 plus, and then we're going to be minus 1 in our r.
00:41
So he's doing this at the end of each month.
00:44
So our interest rate is going to be 0 .06 divided by 12 because we're looking at a monthly.
00:51
So i'm going to put 0 .06 divided by 12 for my interest rate.
00:56
So now the question is how many months, because that's going to be 2 .1...