You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image><image 1> Sanchez & Vukmin, LLP, is a full-service accounting firm located near Chicago, Illinois. Last year, Sanchez provided tax preparation services to 500 clients. Total fixed costs were $265,000 with total variable costs of $180,000. Based on this information, what is the total cost per 800 clients?
A. $712,000
B. $632,000
C. $288,000
D. $424,000

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
A
<image 1> Sanchez & Vukmin, LLP, is a full-service accounting firm located near Chicago, Illinois. Last year, Sanchez provided tax preparation services to 500 clients. Total fixed costs were $265,000 with total variable costs of $180,000. Based on this information, what is the total cost per 800 clients?
A. $712,000
B. $632,000
C. $288,000
D. $424,000

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val