In order to write a good business letter, following principles should be carefully observed. It is written for the help of people who want the guidance to write a best business letter professionally.1) KNOW WHAT TO SAY: The writer of the letter should clearly know in his mind that he wishes to convey to the reader.Before writing or dictating, he should collect the facts; arrange them in the proper order and then start with the letter.2) BE CLEAR: Having arrange the facts and accessed yourself about what you want to say-say it clearly and without any hesitation. Each and every sentence should be clear in its expression so that there is no chance of ambiguous.3) BE BRIEF: Each letter should be as brief as possible. The receiver does not have much time as he /she has to go through a number of letters everyday.May be that in many cases he/she does not have even a single minute for each letter. At the same time briefness should not be at the cost of losing facts.4) BE ACCURATE: To w…