The exponential growth and decay model describes the amount of a particular drug in a patienf:'s bloodstream a certain time after the drug was given to the patient. The amount of this drug in the bloodsteam decreases at a rate of 20% per hour. If 4.9 units of this drug were given to the patient 5.5 hours ago, then how many units remain in his bloodstream now? Round your answer to 3 places after the decimal point (if necessary). Number of units of drug in bloodstream now