InfoPath Dev

I want my form to be able to calculate the level to which a user has completed upon submit.  For example, if there are 10 text fields, and they complete 8, leaving 2 blank, I'd like a node to calculate the form has been submitted 80% complete.  To hold the calculated values needed, I've created separate nodes to hold "total form nodes", "form nodes completed", and then "percent complete".  However, I don't know what formula to put into any of these to make it work.  I've tried using the "Count" function, but I haven't gotten it to work yet.

 Can anyone advise on what the formulas might be to do this?

Here are the default values for each field,

Total form nodes: count(../my:field1 | ../my:field2 | ../my:field3 | ../my:field4 | ../my:field5 | ../my:field6 | ../my:field7 | ../my:field8 | ../my:field9 | ../my:field10)

Form nodes completed: count(../my:field1[. = ""] | ../my:field2[. = ""] | ../my:field3[. = ""] | ../my:field4[. = ""] | ../my:field5[. = ""] | ../my:field6[. = ""] | ../my:field7[. = ""] | ../my:field8[. = ""] | ../my:field9[. = ""] | ../my:field10[. = ""])

Percentage complete: (100 * count(../my:field1[. = ""] | ../my:field2[. = ""] | ../my:field3[. = ""] | ../my:field4[. = ""] | ../my:field5[. = ""] | ../my:field6[. = ""] | ../my:field7[. = ""] | ../my:field8[. = ""] | ../my:field9[. = ""] | ../my:field10[. = ""])) div ../my:Total

Please see http://www.infopathdev.com/forums/p/13042/46146.aspx