The mass of a radioactive substance follows a continuous exponential decay model, with a 7 decay rate parameter of 6% per day. A sample of this radioactive substance has an initial mass of 2.83 kg. Find the mass of the sample after four days. Round your answer to two ' decimal places. Note: This is a continuous exponential decay model. And though the decay rate parameter is 6% per day, the actual decay is not 6% each day