With the above field names and the percentage field using the "Percent" format option:
(field1 * field2) + field3
that did not work so maybe i have something else wrong....do i need to validate anyhting?
here are my fields.
Fuel charge % :
just figured it out
(field1 * filed2) + field3 + field1 to get the total amount.
thanks so much for your time.