Create the field in the table that will store the numbers.
On the form (best displayed as a continuous form/fields horizontal on the
form) create a textbox field via the (ab|) on the toolbox. Open the field's
property window. Type the following in the 'control source'
section:=([NumValue])*0.055
Note: NumValue is the name of my field I created, so replace your field name
in its place.
Create a new textbox field in the 'Form Footer' section of your continous
form. In the 'control source' type the following:=Sum([NumValue])*0.055
Again, replace NumValue with your field name.
I use my continuous form as a subform on a main form. This will list each
record as well as the totals based on the main form record.