Suppose Iron City manufactures cast iron skillets. One model is a 10-inch skillet that sells for $20. Iron city projects sales of 500 skillets per month. The production costs are $9 per skillet for direct materials, $1 per skillet for direct labor, and $2 per skillet for manufacturing overhead. Iron City has 50 skillets in inventory at the beginning of July but wants to have ending inventory equal to 20% of the next month's sales. How many 10-inch skillets should Iron City produce in July? Select one: a. 550 skillets b. 600 skillets c. 650 skillets d. 500 skillets