(LO 4) The following information is available for a company's cost of sales over the last five months. Month January February March April Units sold 480 880 2,000 2,800 Cost of sales $34,200 $ 41,000 $53,000 $65,000 Using the high-low method, the estimated variable cost of sales per unit sold is: Multiple Choice O $23.21. $71.25. $30.24