I am trying to learn how to do my businesss accounting here. Please help a dummie? -

1) A company purchased 100 units for $20 each on January 31. It purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. If the company uses the average cost inventory costing method, which of the following amounts will be the amount of inventory on the December 31 balance sheet? 2) A company purchased 100 units for $20 each on January 31. It purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. If the company uses the LIFO inventory costing method, which of the following amounts will be the amount of inventory on the December 31 balance sheet 3) A company purchased 100 units for $20 each on January 31. It purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. If the company uses the FIFO inventory costing method, which of the following amounts will be the amount of cost of goods sold on the December 31 income statement? 4) A company purchased 100 units for $20 each on January 31. It purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. If the company uses the average cost inventory costing method, which of the following amounts will be the amount of cost of goods sold on the December 31 income statement? 5) A company purchased 100 units for $20 each on January 31. It purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. If the company uses the LIFO inventory costing method, which of the following amounts will be the amount of cost of goods sold on the December 31 income statement?

Your textbook will explain everything.