conversations.from: human
conversations.value: Tim hires two bodyguards.  They each charge $20 an hour.  He hires them for 8 hour per day.  How much does he pay them in a week if he hires them 7 days a week?
  Find the solution.
conversations.from: assistant
conversations.value: It cost him 20*2=$40 an hour for both of them
  That means he pays 40*8=$320 a day
  So he pays 320*7=$2240 a week