Help plz.

Blue Spruce Corp. uses a perpetual inventory system. Data for product E2-D2 include the following purchases. On June 1, Blue Spruce sold 35 units, and on August 27, 40 more units. Compute the cost of goods sold using (a) FIFO, (b) LIFO, and (c) average-cost. (Round average cost per unit to 3 decimal places, e.g. 1.246.)