Question

Going back to 85% of the medicine remaining after each hour, if a patient took a second 400-milligram dose at the twelfth hour, how much medicine would the patient have in his system at the fifteenth hour?
Responses

35 Milligrams
35 Milligrams

246 milligrams
246 milligrams

40 milligrams
40 milligrams

281 milligrams