During its first year of operations, Connor Company paid $51,640 for direct materials and $19,800 in wages for production workers. Lease payments and utilities on the production facilities amounted to $8,800. General, selling, and administrative expenses were $9,800. The company produced 6,800 units and sold 5,800 units for $16.80 a unit. The average cost to produce one unit is which of the following amounts?