Prepare journal entries for the following transactions.

Aug. 4	Sold merchandise on account to S. Miller for $320 plus sales tax of 4%, with 2/10, n/30 cash discount terms.
6	Sold merchandise on account to K. Krtek for $210 plus sales tax of 4%.
10	S. Miller returned merchandise purchased on August 4 for $20 plus sales tax for credit.
13	S. Miller paid the balance due on her account.
15	K. Krtek returned merchandise purchased on August 6 for $40 plus sales tax for credit.
20	K. Krtek paid the balance due on his account.