When considering the cost of roofing materials, many people take into account just the shingle prices. This is incorrect, as a roof made just of roofing shingles will not work. You also need to consider all the accessories that are included in a complete roof system.
Business letters tend to have both the sender and receiver's address and the date at the top of the page and they begin with a polite salutation, such as dear Mr. and Mrs, followed by a blank line before the body or the content of the letter.
Business documents range from brief email messages to complex legal agreements, and my be drafted internally or by outside professionals. A company uses documents to communicate, transact business and analyze its productivity. Business documents range from brief email messages to complex legal agreements. Some documents are prepared by employees and business owners, while others are drafted by professionals from outside of the company, such as accountants and lawyers.