conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: James gets paid $0.50/mile to drive a truck carrying hazardous waste. He has to pay $4.00/gallon for gas and his truck gets 20 miles per gallon. How much profit does he make from a 600 mile trip?
conversations.from: assistant
conversations.value: First find the total payment James receives: $0.50/mile * 600 miles = $300
  Then find how many gallons of gas he needs to buy: 600 miles / 20 miles/gallon = 30 gallons
  Then multiply that number by the price of gas per gallon to find the total cost of the gas: $4.00/gallon * 30 gallons = $120
  Then subtract that amount from James' earnings to find his profit: $300 - $120 = $180