A physicist conducts an experiment with a substance of unknown half-life. At the beginning of the experiment, the mass of the sample is 250 mg and after 4 days it is 50 mg. What is the mass at 20 days from the beginning of the experiment? Answer: mg Note: Enter e for Euler's constant, In for the natural logarithm (base e) and log for the logarithm with base 10. Note: You may round your answer. Please specify at least 3 digits behind the decimal place. So your solution should be accurate up to ±0.001.

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