Question 946257: Marta invested three times as much money in an account paying 6% interest than she did in an account paying 5% interest. If the total interest paid was $1,628.40, how much did she invest in each account?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Marta invested three times as much money in an account paying 6% interest than she did in an account paying 5% interest.
If the total interest paid was $1,628.40, how much did she invest in each account?
:
let x = amt invested at 5%
then
3x = amt invested at 6%, (three times as much as invested at 5%)
:
5% int + 6% int = $1628.40
.05x + .06(3x) = 1628.40
.05x + .18x = 1628.40
.23x = 1628.40
x = .1628.4/.23
x = $7080 invested at 5%
then
3(7080) = $21,240 invested at 6%
:
:
Check this, find the interest from each account.
.05 * 7080 = $354.00
.60 *21240 = 1274.40
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total int: $1628.40
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