A total of $14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest. The combined interest for one year is $539. If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.

Question

A total of $14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest.  The combined interest for one year is $539.  If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.

Steve · Answer

If the amounts are x,y,z then we have x+y+z = 14000 .03x + .04y + .05z = 539 z = 3y Now just solve for x

Marie · Answer

7200