conversations.from: human
conversations.value: The price of buying a wooden toy at the new Craftee And Best store is $20, and the cost of buying a hat is $10. If Kendra went to the shop with a $100 bill and bought two wooden toys and three hats, calculate the change she received.
  Can you solve this problem?
conversations.from: assistant
conversations.value: When Kendra bought 2 toys, she paid 2*$20 = $40
  Since the price of a hat is $10, when Kendra bought 3 hats, she paid 3*$10 = $30
  The total costs for the hats and wooden toys Kendra bought is $40+$30 = $70
  From the $100 bill, Kendra received change worth $100-$70 =$30