conversations.from: human
conversations.value: Jim buys a package of 20 car washes.  Since He bought a package he only has to pay 60%.  A carwash normally costs 15 dollars.  How much did he pay for the package?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: He had to pay for 20*.6=12 car washes
  That means he had to pay 12*15=$180