<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 Every year an amount increases by 1 / 8 th of itself. After two years, its value increases from Rs. 6400. What is the value after two years? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
8100
Every year an amount increases by 1 / 8 th of itself. After two years, its value increases from Rs. 6400. What is the value after two years?
test