At the beginning of the year, Smith, INc., budgeted the following: Units: 10,000 Sales: $100,000 Total variable expenses: $ 60,000 Total fixed expenses: $ 20,000 Variable factory overhead $ 30,000 Fixed factory overhead: $ 10,000 There were no beginning inventories. At the end of the year, no work was in process, total factory overhead incurred was $39,500, and underapplied factory overhead was $1,500. Factory overhead was applied on the basis of budgeted unit production. How many units were produced this year?