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.
We solve the system by substitution method.
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!