Bieber Inc. is a retailer operating in Calgary, Alberta. Bieber uses the perpetual inventory method. Assume that there are no credit transactions; all amounts are settled in cash. You are provided with the following information

Date	Description	Quantity	Unit Cost or Selling Price
Dec.31	Ending Inventory	160	$20
Jan.2	Purchase	100	22
Jan.6	Sale	180	40
Jan.9	Purchase	75	24
Jan.10	Sale	50	45
Jan.23	Purchase	100	25
Jan.30	Sale	130	48

Calculate average cost for each unit (ROUND ANSWERS to 3 decimal places, e.g. 5.125.)

Jan.1	20
Jan.2	20.769
Jan.6	?
Jan.9	?
Jan.10	?
Jan.23	?
Jan.30	?

Jan.1 - (160*20) = 3200; 3200/160 = 20

Jan.2 - Quantity (160+100) = 260; (160*20) = 3200 + (100*22) = 2200; 3200+2200 = 5400; 5400/260 = 20.769

Jan.6 - Jan.30 From this point I keep getting the answers wrong. Is it possible to show me exactly how to calculate the others like how I did for Jan.1 - 2 to get the answers?