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.
So before you send the next batch of letters, find out the main differences between First Class, Priority, and Certified mail. First Class Mail. If you're sending a letter or small package that weighs 13 ounces or less, First Class mail is the least expensive option. For this reason, many businesses opt for this service, whether they're sending bills, invoices, personal letters, cards or small parcels. This type of mail usually arrives within one to three days. Priority Mail