This is a duplicate post: http://forum-en.filemaker.com/t5/Using-FileMaker-Pro/Decimal-Calculation-Not-Working-Right/td-p/55085
Please check your original thread for my response. Your post may be very clear to you but it's not to others. You appear to be answering the very question you are asking.
Sorry for the duplication Phil. I just know there is an answer here. I'll go back to my original post to communicate on it. I duplicated because I didn't want the post to get lost. Someone knows how to do what I want.