The following solution is incorrect, but i still keep it for learning purpose.

This problem can be solved by the system of two linear equations:

Let x represent the original investments into the first mutual fund, and y represents the original investment into the second mutual fund. Then at the moment of the return, the return from the first bank is x+x·0.09=1.09x, and the return from the second mutual fund is y+0,02y=1.02y

To make the system, we use the information that total return is 3320, and original investment into the second fund is 1000 more then into the first one.

1.09x+1.02y=3320

y=x+1000

We solve the system by substitution method.

x=1090

y=2090

Now, all we need is to find the total original investment!

I just have noticed another tutor have solved this problem and have got a completely different answer. I checked the meaning "total return" and realized my mistake. "Total return" is the return on an investment, including income, dividends and interest. It does not include the original mount.

I do not remove my post even though it is incorrect:). It is a good learning process. Thank you for Mr. Philip for covering my back! Great job!