<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the formula for calculating simple interest? Context: The formula for calculating simple interest is (Principal amount) x (Interest rate) x (Time period in years). Answer: [/INST]Simple interest = (Principal amount) x (Interest rate) x (Time period in years).</s>