conversations.from: human
conversations.value: David has $12.48 and wants to buy 16 bolts from a bin at the hardware store. Each bolt costs $0.03. How much money does David have left after paying for the bolts?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: David paid 16 * 0.03 = $0.48 for the bolts.
  David has $12.48 - $0.48 = $12 left.