R purchased 500 shares of Y Corporation common stock for $12,500 on August 31, 2018. She sold 200 shares of this stock for $3,000 on December 21, 2019. On January 7, 2020, R purchased an additional 100 shares of Y Corporation common stock for $1,600.

a) What is R's realized loss for 2019?

b) How much of the loss realized can R report in 2019?

c) What is R's adjusted basis in the 100 shares purchased on January 7, 2020?