Need help with the following question

A manufacturing firm uses a flexible budgeting system. It planned to manufacture and sell 100,000 units of product during the year at a variable cost of $4.00 per unit and a fixed cost of $2.00 per unit. The firm's actual incurred cost of for the year was $515,400 and the manufacturing flex budget variance is $5,000 favorable. What was the firm's actual number of units produced for the year