#8, the right answer is A, $665,000 but why?

Alex Company had the following inventories at the beginning and end of the month of January: The following additional manufacturing data were available for the month of January: Direct materials purchased $189,000 Purchase returns and allowances 1,000 Transportation-in 3,000 Direct labor 300,000 Actual factory overhead 175,000 Alex Company applies factory overhead at a rate of 60% of direct labor cost, and any over applied or under applied factory overhead is deferred until the end of the year, December 31. Alex Company's cost of goods manufactured for January was $665,000 $689,000 $663,000 $681,000