Please help with numbers 4 and 15! Also please let me know if you are missing any information. Thank you!

02. December 3: Byte purchased a Ricoh Color Copier for $4,800.00. The invoice number was 61298. Byte paid 10% in cash and signed a three-year note for the remaining balance. Interest at a rate of 6% a year will be paid semiannually. 03. December 3: Check # 6001 for $2,400.00 was issued by Byte to pay for rent of the office space for December. 04. December 3: Byte received 18 Super Toners for resale to customers at a cost of $25.00 per toner. The invoice number was 7249, and requires payment within 30 days. 05. December 10: Byte sold 13 Super Toners to a customer on account for $52.00 each. The Sales order number was 12100. 06. December 10: Byte records the cost of the 13 Super Toners sold using FIFO. The sales order number was 12100. 07. December 11: Check # 6002 was issued to pay salaries of $2,050.00 to equipment operators. (Ignore payroll taxes at this time.) 08. December 14: Check # 6003 was issued to purchase a one-year insurance policy covering its computer equipment. The cost of the insurance is $6,600.00 and paid to Seth's Insurance. The effective date of the policy was December 16 and the invoice number was 2387. 09. December 15: Byte purchased $650.00 of supplies on account. 10. December 16: Byte received 11 Super Toners purchased for resale to customers. The cost was $33.00 per toner. The invoice number was 7959, and payment is required in 30 days. 11. December 17: Byte was informed that Mr. Madoff who has an account with the company will never pay the $674.00 he owes. Record the transaction to write off Mr. Madoff's accounts receivable account using the allowance method. 12. December 17: Byte received invoice number 26354 in the amount of $875.00 from the local newspaper for advertising. 13. December 18: Check # 6004 was issued to pay Accounts Payable in the amount of $1,120.00. 14. December 19: Byte sold 11 Super toners to a customer on account for $52.00 each. The sales order number was 12101. 15. December 19: Byte records the cost of the 11 Super Toners sold using FIFO. The sales order number was 12101