A medicine in the blood decreases by 20% every hour: A = A0(0.80)^t. After about how many hours is half of it left?

  1. 2.5 hours
  2. 4.6 hours
  3. 3.1 hours
  4. 6.2 hours
Answer

C) 3.1 hours

(0.80)^t = 0.5 Rightarrow t = log 0.5log 0.80 approx 3.1 hours. SLO M-09-A-08 · Application

Mathematics MCQ · More Real Numbers MCQs · Practise