A owns 100% of X Corp. A's basis in her stock is $1,000 on January 1, 2005.

(a) In 2005, X has operating income of $500 and makes a cash distribution of $400. In 2020, X has operating income of $100 and makes a cash distribution of $1,500. In 2007, X has operating income of $100 and distributes a parcel of land with a basis of $200 and fair market value of $300. What effects do these facts have on A's basis in her stock?

(b) Suppose instead that in 2005 X had losses of $600 and became worthless. What consequences to A?