conversations.from: human
conversations.value: Find the answer to this math problem: Tony drives a car that gets 25 miles to the gallon.  He drives 50 miles round trip to work 5 days a week.  His tank holds 10 gallons.  He begins the week with a full tank and when he runs out he fills up at the local gas station for $2 a gallon.  How much money does Tony spend on gas in 4 weeks?
conversations.from: assistant
conversations.value: First, we need to determine how many miles Tony drives in 4 weeks. We do this by performing 50*5=250 miles per week.
  Next, we multiply the weekly total by 4 by performing 4*250= 1000 miles in 4 weeks.
  Now, we need to find out how many times Tony needs to fill up his gas tank. His gas tank holds enough gas to last 25*10=250 miles.
  This means in 4 weeks, he needs to fill up his tank 1000/250= 4 times.
  Since Tony's gas tank holds 10 gallons, this means he needs to pay for 4*10- 40 gallons of gas in a month.
  Since gas costs $2 a gallon, this means Tony spends 40*2=$80 on gas every month,