Display difference in 2 dates as xx.xx?

I'm using a formula to determine the difference between 2 dates - =DATEDIF(C3,E3,"y") & " years, " & DATEDIF(C3,E3,"ym") & " months"

How can I have the result display "9.50" instead of 9 years 6 months

I do need 2 decimals.

Thanx

Aahhh - got it, =IF(E3="","",(DATEDIF(C3,E3,"m")/12))

This works good.