The Percent $P$ Of the Drug Triazolam (A Drug for Treating Insomnia) Remaining

Multiple Choice

The percent $P$ of the drug triazolam (a drug for treating insomnia) remaining in a person's bloodstream after t hours is given by $P = e ^ { - 0.3 t }$ . What percent will remain in the bloodstream after 9 hours?

A) 0.9%
B) 15.4%
C) 0.1%
D) 6.7%
E) 5.4%
​