Final answer:
An office manager sending out new office schedule and payment information would use a memo or a notification letter, which includes specific details such as dates, addresses, and a clear body outlining the changes.
Step-by-step explanation:
In the given scenario, where an office manager sends out a new office schedule and payment information, the type of business letter being used is likely a memo or a notification letter. These documents are meant for internal communication within a company or organization to inform employees about changes or updates. The approach to writing this business letter involves including the date, the sender's complete return address, the recipient's inside address, a polite greeting, a body that is direct and clearly outlines the new schedule and payment details, and a closing. The body should begin with an introduction explaining the purpose of the letter, followed by the necessary details about the schedule and payments, and conclude with any additional information or action required by the employees.