Stock merged/exchange
Please help on figuring how to enter on Sch D. The original purchase on a stock(ex. A stock 100 sh for $10 = $1000 on 1/1/10) got merge/exchange to a (ex. B stock 20 sh on 1/1/15), the B stock 20 sh was sold on 12/1/20 for $40 = $800, how would the cost basis amount, proceeds, the purchase date, adjustment gain/loss be entered? Thanks.