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 Blind Copy a Business Letter. Usually, a hard copy of a business letter is mailed to a single recipient. In some cases, the sender may want to forward a copy of the letter to one or more other individuals, indicated on the letter as carbon copy, or cc, recipients.