Oct. 5 Sold merchandise on account to B. Farnsby for $280 plus sales tax of 4%. 8 Sold merchandise on account to F. Preetee for $240 plus sales tax of 4%, with 2/10, n/30 cash discount terms. 11 F. Preetee returned merchandise purchased on October 8 for $50 plus sales tax for credit. 17 F. Preetee paid the balance due on her account