Apatient's prescription pill was started on 2-16-2016. the prescription label reads " take 1/2 a pill of 60mg 3x a day" there are 30 pills in the bottle. what is the next refill date? ". can anyone show me the step by step how to get to my answer?

Ok so first of all since they are taking half a pill 3x a day we would do .5x3 = 1.5  so she is taking 1.5 pills a day and there are 30 pills. So we are trying to figure out how many days she will have them for so we are gonna do 30/1.5 which equals 15. Now we know she will have to have another refill in 15 days and its the 16th today so we are gonna add 15 to 16 since that is when she will run out and we come up with 31, but there's only 30 days in the month so she would need a refill on 3-01-16