Question

Please help me do these problems. I don't understand how to do weighted averages.
Mrs. Gleason invested a portion of 32000 dollars at 9% interest and the balance at 11% interest. How much did she invest at each rate if her total income from both investments was 3200

Answer 1

Let x = one investment and 32000-x = the other.

.09x + .11(32000-x) = 3200

Solve for x.

Answer 2

a deposit of $2500 grew to $3325 after six years. what is the final value of a deposit of $7500 at the same interest rate for the same period of time?.

Answer 3

you shouldn't rely on others btw