Sandhill Department Store uses a perpetual inventory system. Data for product E2-D2 includes the following purchases. Date May 7 July 28 Number of Units (a1) 40 30 June 1 sale On June 1, Sandhill sold 20 units, and on August 27, 30 more units. Your answer is partially correct. Unit Price LA $12 Calculate the weighted-average unit cost for each sale. (Round answers to 3 decimal places, e.g. 5.125.) $ Aug. 27 sale $ 18 12.000 16.000