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Calculate the sum of: 0.45 + 52.12 + 4.1111 + 206 + 0.00029.

  1. 263.6724

  2. 263.57139

  3. 262.68139

  4. 260.67239

The correct answer is: 262.68139

To determine the correct answer, sum the provided numbers step-by-step: 1. Start with the first number, 0.45. 2. Add in the second number, 52.12: - 0.45 + 52.12 = 52.57. 3. Next, incorporate the third number, 4.1111: - 52.57 + 4.1111 = 56.6811. 4. Then, add the fourth number, 206: - 56.6811 + 206 = 262.6811. 5. Lastly, add the fifth number, 0.00029: - 262.6811 + 0.00029 = 262.68139. The final result is 262.68139, which matches the correct answer in the choices provided. The sum is systematically calculated by ensuring each number is correctly included in the overall total, maintaining precision throughout the addition process.