Problem:

Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March.

• Mar. 1 Beginning inventory 100 units @ $50 per unit
• Mar. 5 Purchase 400 units @ $55 per unit
• Mar. 9 Sales 420 units @ $85 per unit
• Mar. 18 Purchase 120 units @ $60 per unit
• Mar. 25 Purchase 200 units @ $62 per unit
• Mar. 29 Sales 160 units @ $95 per unit
• Totals 820 units 580 units

LIFO:

Weighted Average Perpetual:

Specific identification (for specific identification, the March 9 sale consisted of 80 units from beginning inventroy and 340 units from the March 5 purchase; the March 29 sale consisted of 40 units from the March 18 purchase and 120 units from the March 25 purchase.):

Required:

Question: Compute gross profit earned by the company for each of the 3 costing methods.

Note: Explain all calculation and formulas.