The amount of the ticket should/must be written on the ticket by the office.
According to a Wisconsin clerk of the court, the dollar amount written on your ticket is actually a combination of a forfeiture and numerous surcharges and fees.
A ticket for operating with license expired or without any license is a 3 point surcharge, which is estimated at $125.90.
You should contact the license division directly at (608) 266-2353.