The deduction for this question should be 2 points, which is mainly due to carelessness, because your calculation process and method are correct and have generally met the requirements for answering questions, so the answer is just wrong. According to the scoring principle of each step in the mathematical evaluation rules of college entrance examination, you should deduct 2 points or 1 points and return them to the landlord. That mistake means that you made a mistake from the beginning. If you only make a mistake in the final result, you will only get 2 points deducted. If you made a mistake at the beginning, you should get 7 points according to the standard. Thank you.