Tasty Treats is a snow cone stand near the local park. To plan for the future, Tasty Treats wants to determine its cost behavior patterns. It has the following information available about its operating costs and the number of snow cones served.

Month	Number of snow cones	Total operating costs
January	6,400	$5,980
February	7,000	$6,400
March	6,000	$5,740
April	6,900	$6,330
May	8,100	$7,120
June	7,250	$6,575

The variable cost per snow cone using the

highlow

method is