I am desperately trying to learn how to use Excel and am very new and am not a math whiz to boot. I'm probably trying to run before I can walk in trying to use the "if" function.

All I'm attempting to do is tell a cell to provide one answer if so and so and another answer is so and so. In other words here is my original formula:
=(AD5+AE5)*AF5*3.40-.21. This is where the "if" comes into play ( I think). If AD5+AE5 is less than (4) I want to subtract the (.21) for the end results; if AD5+AE5 is more than (4) and less than (8) I want to subtract (.8) from the end results.
If AD5+AE5 is more than (12) and less than (20) I want subtract (1.3) from the end results etc.

I started this thread earlier today and both response were good (I guess), but neither of the formulas worked. Perhaps someone can still help.

Thanks,
Robertgn