1. Let's understand the problem clearly and see what is being asked. 2. Since you mentioned the answer should be 0.2, let's verify it step-by-step. 3. Please provide the original problem or equation to confirm the solution. 4. Without the problem statement or calculation steps, I cannot confirm the correctness or pinpoint the error. 5. If you share the initial problem or your working so far, I can help walk through the solution carefully.