The contribution margin ratio: Is the percent of each sales dollar that remains after deducting the total unit variable cost. Is the percent of each sales dollar that remains to cover the variable and fixed costs. Is the same as the unit contribution margin Is the percent of each sales dollar that remains after deducting the total unit fixed cost The following information is available for a company's utility cost for operating its machines over the last four months. Month Machine hours Utility cost January 900 $ 5,450 February 1,800 $ 6,900 March 2,400 $ 8,100 April 600 3,600 $4.22. O $2.50. O $3.38 $6.00