How do you figure out FIFO in this problem? Thanks!

Brief Exercise 6-10 a-c (Part Level Submission) Sunland Department Store uses a perpetual inventory system. Data for product E2-D2 include the following purchases. Number of Units Unit Price Date $10 May 7 50 July 28 30 15 On June 1, Sunland sold 20 units, and on August 27, 40 more units. (a) Prepare the perpetual inventory schedule for the above transactions using FIFO. (Round an answers to 0 decimal places, e.g. 1,250.) Product E2-D2 Purchases Cost of Goods Sold Balance Date May 7 June 1 $ $ July 28 $ $ Aug. 27 $