Sarah's scout troop sold 80 boxes of shortbread. Shortbread cookies made up 20% of the troops cookie sales. How many boxes of cookies did sarah's scout troop sell in all

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.