what are the essential features of a business letter?
['Simplicity: A business letter should be simple. ... ', 'Conversational style: An effective letter is one that gives an impression of face to face communication. ... ', 'Clarity of goal: The writer should be clear about what he wishes to convey. ... ', 'Public relation: ... ', "The 'You' attitude: ... ", 'Courteous: ... ', 'Persuading: ... ', 'Sincere:']