drug question

So basically what I did for a) is took the pill on the first day, and then to calculate the amount in the body for each day I multiplied the amount of drugs in the body from the previous day by .75 because if .25 is eliminated that is how much will be left in the body. I then added the amount taken that day to figure out how much total drugs are in the body that day.

For b) i followed pretty much the same pattern as a). I started out with two pills on day one to acquire the 1000mg needed. I then took 1/2 a pill per day until day 9 which gave me my six pills and exacly 1000mg of drugs in the body each day.