Tallahassee, Inc. has provided the following information about its product: Sales price per unit = $900 Variable cost per unit = $315 Rent per month = $800 Supervision per month = $2,000 Machine depreciation per month = $500 How many units must Tallahassee sell each month to earn a target operating profit of $4,000? (Round your answer un to the nearest whole unit.) A. 12 units OB. 3 units OC. 13 units OD. 4 units