conversations.from: human
conversations.value: Mike is saving up to buy a house.  He puts away 10% of his $150,000 a year salary.  He needs to save up 20% of the cost of a $450,000 house for a downpayment.  How long will it take?
conversations.from: assistant
conversations.value: He saves 150,000*.1=$15,000 per year
  He needs 450,000*.2=$90,000
  So he needs to save for 90,000/15,000=6 years