Answer:
Explanation:
1) 18 1/2 gallons = 18.5 gallons
4 1/4 hours = 4.25 hours -->
18.5 gallons/4.25 hours
2) Aqua Plus: $237.36/2 years = $118.68/year
Water World: $184.50/18 months = $184.50/1.5 years = $123/year
118.68 < 123, 123 - 118.68 = $4.32.
Aqua Plus costs less by $4.32