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.
Difference Between ZIP Code and Postal Code. Though the advent of SMS and email has adversely affected the business of physical mails, they still constitute a bulk of messages and letters sent and received across the world. In fact email can never substitute a formal letter which has its own sanctity and importance.