conversations.from: human
conversations.value: Solve the following math problem: The basketball team sold 50 cupcakes for $2 each and 40 cookies for $0.5 each. Then the money from their sales was used to buy two basketballs that cost $40 each. The rest of the money was used to buy 20 bottles of energy drinks. How much does a bottle of energy drink cost?
conversations.from: assistant
conversations.value: The basketball team earned 50 x $2 = $100 from selling cupcakes.
  They also earned 40 x 0.5 = $20 from selling cookies.
  So their total earnings was $100 + $20 = $120.
  The two basketballs cost $40 x 2 = $80.
  Thus, $120 - $80 = $40 was used to buy the 20 bottles of energy drinks.
  Therefore, each bottle of energy drink costs $40/20 = $2.