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 Communication. Messages are constantly being sent by people all over the world, they can be verbal through talking or written through mail. In business world the style sending a message is different. Here you are dealing with executives of the companies, sales agents, managers, employees and clients.