Answer:
Step-by-step explanation:
1 billion = 10^9
10^9 people * (10 Liters)/person = 10^10 Liters
15p+15p+25p=30p+25p=55p
All you have to do is take 45$ and divide it by 1/3 then when you get that answer divide it by 1/4 to get your answer. So I believe your answer will be less than a dollar.
