conversations.from: human
conversations.value: John hires a driving service to get him to work each day.  His work is 30 miles away and he has to go there and back each day.  He goes to work 5 days a week for 50 weeks a year.  He gets charged $2 per mile driven and he also gives his driver a $150 bonus per month.  How much does he pay a year for driving?
  How to solve this?
conversations.from: assistant
conversations.value: He has to travel 30*2=60 miles per day
  That means he travels 60*5=300 miles per week
  So he pays 300*2=$600 per week
  That means he pays $600*50=$30000 a year for miles driven
  He also gives $150*12=$1800 a year as a bonus to his driver
  So he pays $30000+$1800=$31,800 a year