i have a select box with some integer value, how can i fix to show 1decible number?

i have a select box with some integer value, how can i fix to show 1decible number?

HI all,
i have a problem to fix one digit decimal no for select values. i am fetching the integer value from database which is going to be in decimal number by the ruby code. but i am facing the problem with decimal number. some option in select list showing so 7-10 decimal number but i want to fix it for one decimal point. please help me for this and give me some code or idea related to this.

thank you