Answer: A letter or memo of transmittal acts as an introduction to a formal report.
Answer choices are: acts as an introduction to a formal report; lists the figures used in a report; provides a place to record the headings and page numbers in your report.
A letter of transmittal is a covering letter which allow the reader to understand the importance of the report attached to it. It also establishes a relationship between the writer and the reader. When your coworker asked about the purpose of the letter or memo of transmittal, tell her that a letter or memo of transmittal acts as an introduction to a formal report.