7. After taking a prescription medication, trace amounts stay in your system for an extended period of time. For example, on Wednesday, Daphne takes an allergy pill containing 128 milligrams of medicine, and takes
another on Saturday. Assume that each day Daphne's body processes half of the medicine in her system
from the day before. Determine the amount left in Daphne's system on the next Wednesday, and on what
day the amount of medication in her system will be less than 10 mg.