Question

clear water pool service (cwps) provides the maintenance for over 7,000 pools in southwest florida. in 2010, cwps purchased vehicle routing and scheduling software and a gps track locator system. before the use of the “smart system”, cwpss vans and trucks drove 1.26 million miles to service these pools on monthly and weekly appointment schedules. after one year of using the “smart system”, cwps reduced total miles driven to 1.03 million miles and, as a result, saved 13,000 gallons of gasoline annually. lately, cwps replaced a fleet of pool service vans with hybrid/electric - and gasoline - driven systems. this reduced the number of gallons of gasoline used to 8,000 gallons per year. unleaded gasoline has 8.91 kilograms (19.643 lb) of carbon dioxide (co2) per gallon, and 1 metric ton equals 1,000 kilograms (kg), according to government sources. how many metric tons of carbon dioxide did not go into earths atmosphere because cwps changed to hybrid - powered vehicles? round your answer to two decimal places. metric tons of co2 per year

Explanation:

Step1: Calculate gallons of gasoline saved

The company previously used 13000 gallons of gasoline annually and now uses 8000 gallons per year. The gallons of gasoline saved is the difference between the previous usage and the current usage.
$13000 - 8000=5000$ gallons

Step2: Calculate kilograms of $CO_2$ not emitted

Each gallon of unleaded gasoline has 8.91 kilograms of $CO_2$. Multiply the gallons of gasoline saved by the amount of $CO_2$ per gallon.
$5000\times8.91 = 44550$ kg

Step3: Convert kilograms to metric tons

Since 1 metric ton equals 1000 kilograms, divide the total kilograms of $CO_2$ not emitted by 1000.
$\frac{44550}{1000}=44.55$ metric - tons

Answer:

44.55