I need help with how to calculate the answers. If you can show your work that would help so that on future questions i understand how to do it.

In 2004, SW purchased 1,000 shares of Delta stock. On May 20 of the current year, it sold these shares for $90 per share. In each of the following cases, compute SWs recognized gain or loss on this sale. Also, in each case in which SW purchased 1,200 Delta shares in the current year along with selling the 1000 shares, compute its tax basis in the new shares.

a) SWs cost basis in the 1,000 shares was $104 per share. It did not purchase any other Delta shares during the current year.

b) SWs cost basis in the 1,000 shares was $104 per share. It purchased 1,200 shares of Delta on May 1 of the current year for $92 per share and held these 1,200 shares throughout the remainder of the year.

c) SWs cost basis in the 1,000 shares was $104 per share. It purchased 1,200 shares of Delta on June 8 of the current year for $92 per share and held these 1,200 shares throughout the remainder of the year.

d) SWs cost basis in the 1,000 shares was $79 per share. It purchased 1,200 shares of Delta on June 8 of the current year for $92 per share and held these 1,200 shares throughout the remainder of the year.