A family of five recently replaced its 5-gallon-per minute showerheads with water-saving 2-gallon per minute showerheads. Each member of the family averages 8 minutes in the shower per day. In a 30-day period, how many few gallons of water will the family use with the new showerheads?
1. 60
2. 800
3. 2400
4. 3600
5. 7200