conversations.from: human
conversations.value: A country used to have a tax rate of 20%.  They raised it to 30%.  In that same time frame, John went from making 1,000,000 a year to 1,500,000 a year.  How much more does he pay in taxes now compared to then?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: At 20% he paid .2*1000000=$200,000
  Now he pays 1500000*.3=$450,000
  So he pays an extra 450000-200000=$250000