The O'Connor Company produces model cars which it sells for $35 per unit. The company recently had the following costs to produce 6,000 units: (a) rent on the factory $20,000, (b) wages for sales personnel $9,600, (c) salary for factory manager $3,800, (d) utilities for factory $1,750, (e) plastic used in production $8,000 and (f) product brochures $1,800. What was the companys variable cost per unit? Round your final answer to the nearest penny.