# math

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a mother wants to \$9000 for her son's future education. She invested a portion of the money in a bank certificate(CD account) which earns 4% and the reminder in a savings bond that earns 7%. If the total interest earned after one year is \$540, how much money was invested in the CD account

• math -

Assuming 9000 was invested, then if x was at 4%, then 9000-x was at 7%.

.04x + .07(9000-x) = 540
x = 3000

\$3000 in CD
\$6000 in savings

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