Lucy Sportswear manufactures a specialty line of T-shirts using a job order cost system. During March, the following costs were incurred in completing Job ICU2: direct materials, $13,700; direct labor, $4,800; administrative, $1,400; and selling, $5,600. Factory overhead was applied at the rate of $25 per machine hour, and Job ICU2 required 800 machine hours. If Job ICU2 resulted in 7,000 good shirts, the cost of goods sold per unit would be:

a.$5.70. b.$6.50. c.$5.50. d.$6.30.