conversations.from: human
conversations.value: Find the answer to this math problem: Building one birdhouse requires 7 planks and 20 nails.  If 1 nail costs $0.05, and one plank costs $3, what is the cost, in dollars, to build 4 birdhouses?
conversations.from: assistant
conversations.value: The cost of the planks for one birdhouse is 7 * 3 = $21.
  And the nails are a cost of 20 * 0.05 = $1 for each birdhouse.
  So to build one birdhouse one will need 21 + 1 = $22.
  So the cost of building 4 birdhouses is at 4 * 22 = $88.