a mother wants to invest 5000 for her sons future education. She invests a portion of the money in a bank certificate of deposit which earns 4% and the remainder in a savings bond that earns 7%. If the total interest earned after one year is $300.00,how much money was invested in the CD account

Answer 1

if there is x in the CD account, then the rest (5000-x) is in the bond. So, just add up the interest:

.04x + .07(5000-x) = 300