BigTex Co. manufactures office furniture. During the most productive month of the year, 1,500 desks were manufactured at a total cost of $41,000. In its slowest month, the company made 900 desks at a cost of $30,800. Using the high-low method of cost estimation, total fixed costs in July are:

cannot be determined from the data given

$15,500

$20,200

$17,600