Answer:
Only those transactions that involve cash payments or cash receipts are recorded in the cash journal:
May 1, C. Li contributes cash tot he company
Dr Cash 12,000
Cr C. Li., capital 12,000
May 15, cash received from bank loan
Dr Cash 8,500
Cr Notes payable 8,500
May 18, collections from E. James
Dr Cash 1,250
Cr Accounts receivable 1,250
May 24, merchandise sold to B. Cox
Dr Cash 950
Cr Sales revenue 950
Dr Cost of goods sold 900
Cr Inventory 900
The May 7 and May 9 transactions should be recorded in the sales journal but not in the cash journal since they involve accounts receivables. COGS from May 24 transaction should also be recorded in the cash journal because the sales were on cash.