Answer:
10.168 mg
Explanation:
Amount of caffeine in body = 110 mg
Decreases at the rate of rate of 18% per hour
how much caffeine will be in your bloodstream after 12 hours
After the first hour;
New amount = 110 - (0.18 * 110) = 90.2 mg
After the second hour;
New amount = 90.2 - (0.18 * 90.2) = 73.964 mg
After the third hour;
New amount = 73.964 - (0.18 * 73.964) = 60.65 mg
After the fourth hour;
New amount = 60.65 - (0.18 * 60.65) = 49.733 mg
After the fifth hour;
New amount = 49.733 - (0.18 * 49.733) = 40.78 mg
After the sixth hour;
New amount = 40.78 - (0.18 * 40.78) = 33.44 mg
After the seventh hour;
New amount = 33.44 - (0.18 * 33.44) = 27.4208 mg
After the eighth hour;
New amount = 27.4208 - (0.18 * 27.4208) = 22.485 mg
After the ninth hour;
New amount = 22.485 - (0.18 * 22.485) = 18.4377 mg
After the tenth hour;
New amount = 18.4377 - (0.18 * 18.4377) = 15.119 mg
After the eleventh hour;
New amount = 15.119 - (0.18 * 15.119) = 12.40 mg
After the twelfth hour;
New amount = 12.40 - (0.18 * 12.40) = 10.168 mg