# math

posted by
**brianna**
.

Sonia received a statement on her Certificate of Deposit showing that her investment had returned $3526.25 over its life. If the Certificate of Deposit pays a simple interest rate of 3.1% and her initial investment was $17,500 how long had the money been invested? i think i have to mult. 17500 by 3.1%, then i think i have to