True. A calculator tape can serve as a source document for daily sales.
Explanation: A calculator tape, also known as a register tape or cash register tape, records the amounts of sales transactions processed throughout the day by a cash register or calculator. Each time a sale is made, the details such as the item sold and the total amount are printed on this tape. At the end of the day, businesses often review this tape to summarize their sales, making it an important document for tracking daily revenue and for accounting purposes. Therefore, it is accurate to state that a calculator tape is a source document for daily sales.