In the aftermath of a hurricane, an entrepreneur took a one-month leave of absence (without pay) from her $3,000 per month job in order to operate a kiosk that sold fresh drinking water. During the month she operated this venture the entrepreneur paid the government $3,500 in kiosk rent and purchased water from a local wholesaler at a price of $1.42 per gallon. If consumers were willing to pay $2.53 to purchase each gallon of fresh drinking water, how many units did she have to sell in order to turn an economic profit