Final answer:
The accountant should record the $100 cash received and the remaining $240 due in 25 days. Debit the cash account for $100 and credit the accounts receivable account for $340 ($100 cash + $240 due).
Step-by-step explanation:
When recording this transaction, the accountant should note the payment of $100 cash received and the remaining $240 due in 25 days.
This can be recorded in the accounts as a debit to the cash account for $100 and a credit to the accounts receivable account for $340 ($100 cash + $240 due). This ensures that the payment is properly documented and the remaining amount is accounted for.