A floral shop is analyzing the cost of making deliveries. They believe miles driven is the cost driver of delivery van operating costs. Here is historical data on miles and costs. Use the High-Low method to determine the cost function for this cost. What would predicted van operating costs be at 18203 miles?

	Miles Driven	Van Operating Costs
January	15500	$5,400
February	17500	$5,350
March	14400	$4,980
April	16400	$5,280
May	16900	$5,580
June	15300	$5,010
July	13500	$4,590

Enter your final answer to two decimal places.