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 and personal-business letters are usually mailed in No. 10 envelopes (4 1/8 x 9 1/2), but personal-business letters can also be mailed in No. 6 3/4 envelopes (3 5/8 x 6 1/2). Business envelopes typically have the return address preprinted; therefore, return addresses are keyed only for personal-business letters or when a letterhead envelope is not available. You can use the envelope feature of your word processing program to create the