The town used to emit 800 pounds of carbon a year because 80 x 10 = <<80*10=800>>800

20 now take the bus because 80 x .25 = <<80*.25=20>>20

60 people still drive because 80 - 20 = <<80-20=60>>60

Those 60 people create 600 pounds of carbon because 60 x 10 = <<60*10=600>>600

The town now emits 700 pounds of carbon because 100 + 600 = <<100+600=700>>700

The town emits 100 fewer pounds of carbon now because 800 - 700 = <<800-700=100>>100

# Answer

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<|im_start|>system
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<|im_start|>user
In Johnstown, the population is 80 and every single person drives by themselves to work. Each car on a road pollutes 10 pounds of carbon a year. A single bus pollutes 100 pounds of carbon a year. A bus can hold 40 people. The town decides to start running a bus and 25% of the people who used to drive now take the bus. How many fewer pounds of carbon are now emitted per year?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
100
In Johnstown, the population is 80 and every single person drives by themselves to work. Each car on a road pollutes 10 pounds of carbon a year. A single bus pollutes 100 pounds of carbon a year. A bus can hold 40 people. The town decides to start running a bus and 25% of the people who used to drive now take the bus. How many fewer pounds of carbon are now emitted per year?
train