00:01
Okay, so a man invests his savings in two accounts, one paying 6 % and then paying 10 % simple interest per year.
00:09
He puts twice as much in the lower yielding account because it is less risky.
00:14
His annual interest rate is $3 ,520.
00:18
How much did he invest that reach rate? okay, so we have two variables, x is equal to the amount invested into our 6 % account.
00:33
So 6 % account, okay, and that's what y equal to our 10 % or the amount is invested into 10 % account.
00:50
So we know that we have our percentage, 0 .6 times the amount invested into our 6 % account plus our 10 % account plus the amount or times the amount invested into our 6 % account.
01:11
Is equal to our annual interest that we got back, which is 3 ,520.
01:21
And we know that he put twice as much in his lower yielding account because it is less risky.
01:30
So x is equal to 2 times y.
01:34
How do we know that? well, if he invest twice as much, let's say y is equal to 2, then his lowest yielding account should be double.
01:47
That...