



 
Javier, If this is simple interest not compounded and the annual interest rate is r then for a $10,000 investment the interest earned is $10,000 × r each year. Thus in 2 years the balance in the account would be
Add to this the amount added to the account from an investment of $3,500 for 1 year. The sum of these two numbers is $15,569.75. Solve for r. Penny  


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