A college graduate made $28,000 in her first year working. She invested half the money in two CDs that earned 3% and 5% annual interest. After one year she earned $625 in interest. How much was invested in the 3% account?
let x and y be the amount she invested in the 3% and 5% account respectively.
We know that $\displaystyle x+y=\frac{28000}{2}=14000$ ___(1)
and $\displaystyle \frac{3}{100}x+\frac{5}{100}y=625$___(2)
You should be able to continue.
Cheers
P.S. please show your work and where you're stuck next time