Brief Exercise 8-15 [LO 8-3] Wallace Heating is attempting to estimate its costs of manufacturing heating ducts for the coming year using the high-low method. The cost driver is number of labor hours. Wallace determines that the high and low costs are $27,049 and $19,772, respectively, and the values for the cost driver are 4,168 and 2,672 hours, respectively. What is the variable cost per hour? (Round your answer to 2 decimal places.) Variable cost per hour