Ibra Trader uses the perpetual inventory system. All sales returns from customers result in the goods being returned to inventory. Assume that there are no credit transactions and the inventory returned is not damaged. You are provided with the following information of the company for the month of April 2020.

Date	Description	Quantity (kg)	Cost per unit (OMR)	Selling price per unit (OMR)
April 1	Beginning inventory	800	10
2	Purchase	400	12
5	Purchase return of 2nd dated purchase	40	?
6	Purchase	240	12
11	Sale	1,000	?	18
18	Sale	300	?	20
23	Purchase	100	13
28	Sale	160	?	22
30	Sales return of 28th dated sale	10	?	22

Question 4:

1. You are required to calculate units and cost of goods sold; units and cost of ending inventory; and gross profit for each of the following cost flow assumptions.
   1. FIFO, and (3.5 Marks)
   2. LIFO. (3.5 Marks)
2. Write any three control procedures to be followed over purchase. (3 Marks)