Wash Sale

Mort owns 100 shares of Pear with an adjusted basis or cost of $50 per share or $5,000. On July 28, 2019, Mort sells all his shares for $3,000. On August 16, 2019 he purchases 100 shares of Pear for $3,400. A. What is Mort's recognized gain or loss from the July 28, 2019 stock sale? B. What is Mort's basis or cost of his August 16, 2019 stock? C. When does the holding period begin for the August 16, 2019 stock? D. If Mort's waited until December 29, 2019 to purchase 100 shares of Pear instead of August 16, 2019 what would have been the recognized gain or loss from the July 28, 2019 stock sale?