QUESTION 17 Davis, Inc.publishes and sells accounting textbooks. Presented below is monthly cost and sales information for Davis: Month Units sold Total Selling costs January 1.200 58,000 February 1.100 8.200 March 1,600 11.200 Davis uses the high-low method to estimate fixed and variable selling costs. Based on the above. Davis' estimated variable selling cost per unit is: $8.00 $6.00 O $7.45 $6.67 $7.00