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.
How to Write a Business Letter. A business letter is a formal document, with a set structure. As you can see from the examples in the links above, a business letter has a very defined format. A business letter includes contact information, a salutation, the body of the letter, a complimentary close, and a signature. There are rules for everything from how wide the letter's margins should be to what font size to use. In general, it's wise to keep the body of your business letter direct and brief.