Hi, I am having a lot of trouble with this question. Can someone please explain it?

Assume that a retailer's beginning inventory and purchases of a popular item during January included: (1) 450 units at $8.50 in beginning inventory on January 1, (2) 600 units at $9.50 purchased on January 8, and (3) 900 units at $10.50 purchased on January 29. The company sold 500 units on January 12 and 700 units on January 30. Required: 1. Calculate the cost of goods sold for the month of January under (a) FIFO (periodic calculation), (b) FIFO (perpetual calculation), (c) LIFO (periodic calculation), and (d) LIFO (perpetual calculation). Cost of Goods Sold a. FIFO (periodic calculation) b. FIFO (perpetual calculation) C. LIFO (periodic calculation) d. LIFO (perpetual calculation) 2. Which cost flow assumption and calculation approach would you recommend to management in order to save taxes? O FIFO Periodic O FIFO Perpetual OLIFO Periodic OLIFO Perpetual