This is one of my friend's homework for some m/c question but he just get stuck on the problem, so could you plz help him out to see how to solve it

Thanks!

X Inc. owns 80% of Y Inc. During 2009, X Inc sold inventory to Y for $10,000. Half of this inventory remained in Y's warehouse at year end. Half of this inventory remained in Y's warehouse at year end. Also during 2009, Y Inc sold Inventory to X Inc. for $5,000. 40% of this inventory remained in X's warehouse at year end. Both companies are subject to a tax rate of 50%. The gross profit percentage on sales is 20% for both companies. Unless otherwise stated, assume X Inc. uses the cost method to account for its Investment in Y. Inc. 1. What is the after-tax dollar value of X's unrealized profits during the year on its sales to Y? a) $2,000. b) $400. c) $200. d) $500. 2. What is the after-tax dollar value of X's realized profits during the year on its sales to Y? a) $2,000. b) $400. c) $200. d) $500. 3. What is the after-tax dollar value of Y's unrealized profits during the year on its sales to X? a) $200. b) $300. c) $400. d) $500. 4. What is the after-tax dollar value of Y's realized profits during the year on its sales to X? a) $200 b) $300 c) $400 d) $500 5. What effect (if any) would Y's unrealized profits on its sales to X have on the noncontrolling interest? a) There would be no effect. b) There would be an increase to the non-controlling interest account in the amount of $30. c) There would be a decrease to the non-controlling interest account in the amount of $40. d) There would be a decrease to the non-controlling interest account in the amount of $30. 10. What would be the journal entry to eliminate any unrealized profits from the Consolidated Financial Statements during the year? Debit a) Cost of Goods Sold Credit $700 Inventory b) Sales $700 $15,000 Cost of Goods Sold c) Sales $15,000 $15,000 Cost of Goods Sold Inventory d) Cost of Goods Sold Inventory $12,000 $3,000 $400 $400 12. Assume that Y Inc. reported an after-tax net income of $20,000 in 2009, what would be Y's adjusted net income for the year? a) $20,000. b) $19,800. c) $20,200. d) $19,840