The amount W of water used varies directly with the population 'N' of people. City 'A' has a population of 483,000 people and used 37.6 billion gallons of water in a fiscal year. Find out how many billion gallons of water we would expect City 'B' to use if we know that its population is 150,000W= (?) Billion of gallons of waterType an integer or decimal rounded to the nearest tenth as​ needed.