Under absorption costing, a company had the following unit costs when 9,000 units were produced. Direct labor $7.25 per unit Direct material $8.00 per unit Variable overhead $5.50 per unit Fixed overhead ($67,500/9,000 units) $7.50 per unit Total production cost $28.25 per unit Compute the total production cost per unit under variable costing if 30,000 units had been produced.