I am stuck on 2. b. I cant get that formula to work in excel . I need to know how to correctly add that formula in exfel so that is produces the answer

I have a formula that I need to enter in excel for employer monthly contributions but I cant find the correct formula that will work when I enter it . I need to use the =IF function to enter =IF (percent _investment

I kneo theat it has something to do with the then ans else statements but i need to know the exact formatting of that statement to enter in cell E6