Answer:
Comet's E&P will decrease by $50,000 due to the exchange.
Step-by-step explanation:
50 of Pam's shares are worth 50 x $1,000 = $50,000, since the corporation is redeeming them, it will do so by decreasing its earnings and profits (retained earnings account).
Generally when larger corporations buy back stocks (AKA treasury stocks), they will credit cash and debit treasury stocks, but since Pam's stocks are being retired, they are not going to be held as treasury stocks, therefore E&P must decrease.