The beginning inventory of laptops at Open Co and data on purchases and sales in Jan as follows Date 11 14 15 16 Transaction Opening Bal Purchase Sale Sale Purchase Purchase Sale Purchase Sale Number of units 200 200 250 100 150 100 250 400 250 Cost per unit ($) 400 390 350 410 380 Assume that Open Co maintains perpetual inventory system, prepare the stock cards using (a) FIFO method (b) LIFO method (c) Weighted average cost method Also, prepare profit and loss statement for each of above method, given that, during Jan, Open Co has incurred following expense: - Sale commission: $10 per unit sold Staff salary: $20,000 Depreciation: $3,000 Revenue during the month: $500,000 Tax rate: 20%