Pay sales tax with the Retail Sales Tax Return For Occasional Sales (DR 0100A) on the tangible personal property included in the purchase of the business by the 20th day of the month following the sale.
So, to avoid pregnancy she has to better avoid unprotected sexual intercourse in this period. The rest of the days i.e., starting from menstruation to the 10th day and again from 21st day up to menstruation are the safe days or the safe period to avoid pregnancy.
The average menstrual cycle is 28 days from Day 1 to Day 1 of your period. However, anywhere from 25 to 31 days between periods is considered a normal menstrual cycle. The best thing to do when you suspect that you're experiencing abnormal bleeding or menstrual cycles is to consult with your health care provider.