just B please, what am i missing?

b. On September 30 , Valerian Company had a $111,500 balance In Accounts Recelvable. During October, the company collected $11,890 from its credit customers. The October 31 balance in Accounts Recelvable was $107,000. Determine the amount of $ a on credit that occurred in October. c. During October, Alameda Company had $120,500 of cash recelpts and $121,150 of cash disbursements. The October 31 Cash balance was $27,600. Determine how much cash the company had at the close of business on September 30 . *) Answer is not complete. Camplete this question by entering your answers in the tabs below. On September 30. Valerian Company had a \$111,500 balance in Accounts Receivable. During October, the company collected $111,990 from its credit customers. The Octobar 31 balance in Accounts Recelvable was $107,000. Determine the amount of sales on credit that occurred in October