conversations.from: human
conversations.value: Matilda bought a smartphone for $300. Then she decided she wouldn't use it anyway and sold it for $255. What percentage of the initial cost did she lose?
conversations.from: assistant
conversations.value: The difference between the initial cost and the amount she sold the phone for is $300-$255 = $45
  $45 is (($45/$300)*100)% = 15% of $300