please explain. Many thanks!

On January 1, 2020, Cullumber Company had Accounts Receivable $136,100, Notes Receivable $39,600, and Allowance for Doubtful Accounts $29,500. The note receivable is from Willingham Company. It is a 4-month, 7% note dated December 31, 2019. Cullumber Company prepares financial statements annually at December 31. During the year, the following selected transactions occurred. Jan. 5 20 Feb. 18 Apr. 20 30 May 25 Aug. 18 25 Sept. 1 Sold $34,600 of merchandise to Sheldon Company, terms /15. Accepted Sheldon Company's $34,600, 3-month, 6% note for balance due. Sold $24.200 of merchandise to Patwary Company and accepted Patwary's $24,200, 6-month, 7% note for the amount due Collected Sheldon Company note in full. Received payment in full from Willingham Company on the amount due. Accepted Potter Inc's $21.200, 3-month. 5% note in settlement of a past-due balance on account. Received payment in full from Patwary Company on note due. The Potter Inc. note was dishonored. Potter Inc. is not bankrupt; future payment is anticipated. Sold S10.500 of merchandise to Stanbrough Company and accepted a $10,500, 6-month, 8% note for the amount due. Journalize the transactions. (Omit cost of goods sold entries.) (Credit account titles are automatically indented when amount Is entered. Do not indent manually. Record journal entries in the order presented in the problem.) Account Titles and Explanation Credit Nccounts Receivation 14600 ite Debit 4800