Myxed Corporation believes that its production cost has both variable and fixed components. The following production cost data is available for two levels of monthly production volume. Production volume in units Direct materials Direct labor Manufacturing overhead 4,000 5,000 $89,200 $ 111,500 $ 86,800 $ 108,500 $ 24,000 $27.300 The best estimate of the monthly variable cost per unit is: (NOTE: Enter a number with two decimal places, do not add commas or dollar signs. Enter a minus sign for a negative number)