The following information is provided for the sales of a merchandise item for the first week of January 2021: January 1st purchased 900 units @ $10 January 2nd, purchased 600 units @ $11 January 2nd, Sold 700 units January 3rd, purchased 400 units @ $12 January 4th sold 1,000 units January 5th, sold 50 units. 

Required: Record in the perpetual inventory sheet for the above transactions, clearly showing the inventory balances using the FIFO method of pricing merchandise issuance.