Answer:
Formal
Step-by-step explanation:
The tone of the message should be forma because, first of a it was addressed to the company(Flannery Electronics) making it official.
In the capacity of a representative of Flannery Electronics the letter should be addressed formally
A formal letter is one written in a formal and specific language and follows a certain format. Letters like these are written for official purposes and are addressed to authorities, dignitaries, colleagues, seniors, etc and not to personal contacts, friends or family.