It should be formal. But what do I know :)
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The two types of business letter are the formal and informal.
A formal document would be the type a professional would send in the course of doing business. Informal would be they type you would send to a friend or relative. It would have less rigid structure, focusing more on the content. Also an informal document such as a text message or email does not have a layout but formal documents such as a letter or a newspaper article.
One would use formal language in a business letter because it is a formal means of communication. When writing a business letter, one wants the tone to be professional. Formal language can help the writer to achieve this.
formal is the cinema and informal is a gay man
A social letter is a formal letter to someone that you many not know or may not know well, usually sent as a courtesy to thank someone, an invitation or an announcement of a social event or occasion, or a formal request or inquiry.A personal letter is a letter sent to someone you know, usually well, such as a family member, a friend, or a neighbor. The closeness or familiarity of the writer and recipient dictates how formal or informal a personal letter will be.A business letter is a letter for the purpose of conducting some form of business, an announcement, an introduction, a cover letter for a submission or application, to solicit sales, a response to an inquiry or a complaint, an invitation to a business event, etc. A business letter can be for any business purpose of an individual, a company, agency, or organization.