Assume that a radiologist group practice has the following cost structure: Fixed costs $472,682 $26 Variable cost per procedure Charge (revenue) per procedure $104 Furthermore, assume that the group expects to perform 7,089 procedures in the coming year. What is the group's contribution margin per unit? (Omit the "$" sign and commas in your response. For example, $123,456 should be entered as 123456.)