Answer: credit; $200
Step-by-step explanation:
The journal entry to record the sale of treasury stock using the cost method would include a credit to Treasury Stock in the amount of $200.
Using the cost method, the journal entry should reflect the sale of the stock at the original price it was purchased at ( its cost). With the original cost of purchase being $20, the 10 shares that were sold will be recorded as;
= 10 shares * $20
= $200
This will be credited to the Treasury account and along with the additional amount made on the sale, debited to the cash account to reflect a cash increase.