To augment her retirement income, Lisa has been saving

money each month. For five years, she made deposits of

$325 at the end of each month into an account paying 10.4%

compounded monthly. The interest rate then changed to

9.5% compounded monthly, and she continued to make the

same monthly payments for another four years.

a)

How much money did she have at the end of the nine-

year period?

b)

How much of this amount was interest on her deposits?