Badlands, Inc. reports the following information for the year ended December 31: Units sold 640 units Sales price $120 per unit Direct materials $28 per unit Direct labor $9 per unit Variable manufacturing overhead $15 per unit Fixed manufacturing overhead $12 per unit Variable selling and administrative costs $4 per unit Fixed selling and administrative costs $12,700 per year The operating income calculated using variable costing and absorption costing amounted to $9,400 and $11,200 respectively. There were no beginning inventories. Determine the total number of units produced during the year.