2 Special order Zenon Inc. has determined the following cost data: Variable Manufacturing Fixed Manufacturing Variable Selling Fixed Selling and Admin $15 per unit $36.000 $1 / unit $18.000 The normal selling price is $25 per unit. The company has an opportunity to bid on a one-time only sale of 1,000 units. The variable selling costs would be replaced by a bulk shipping charge of $500. If excess capacity exists, and this order would not disturb regular sales, what would be the company's incremental cost per unit of accepting this special offer