Final answer:
Not an example of good writing tips for a business letter is advice that promotes unclear language, verbosity, and disregard for the audience and tone, such as ignoring numerous grammatical errors.
Step-by-step explanation:
What is not an example of good writing tips for a business letter? The answer is any tip that suggests using unclear language, being overly verbose, or disregarding the tone and audience of the letter. Good business writing should always be clear, concise, and aware of the audience's needs and expectations. Examples of poor advice would include ignoring typos, being too casual or informal when a professional tone is necessary, or writing lengthy paragraphs that make the purpose of the letter unclear.
Therefore, suggesting that a business letter can contain 'several or most entries are not long enough or there are more than 5 grammatical or other writing errors' is not a good writing tip. Effective communication in business situations depends on precision and correctness. Disregarding these elements could undermine the writer's credibility and the message's effectiveness.