A mother wants to invest $15,000.00 for her son's future education. She invests a portion of the money in a bank certificate of deposit (CD account) which earns 4% and the remainder in a savings bond that earns 7%. If the total interest earned after one year is $900.00, how much money was invested in the CD account?

The total interest earned after one year is $900.00

How much money was invested in the CD account? $??

(Round to the nearest cent, if necessary.)