How to store decimal numbers as options group values?

Hello all,

I have a major problem!

I spent 10 days in making a survey using Access 2007 trying to impress my boss by doing something new, so after I filled the forms with option groups I discovered that I can't store decimal numbers in their values! for example:

If I have an option group called "Ranking" and I have 3 options like:

1

1.5

2.5

and I want to store the real value as it is in the database without rounding! because every time I modify the value in the properties of any option Access keep rounding automatically!

please make my day and tell me how to do it :( I tried to change the column property and set it to number and decimal but still am not able to store decimal values!

Thanks in advance for you all