conversations.from: human
conversations.value: Julieta went to the store to buy a backpack and three ring-binders for her school supplies. She knew the backpack was $50, and each ring-binder cost was $20. However, at the store, she found out that the price of a back had increased by $5, and the price of a ring-binder had reduced by $2. Calculate the total amount of money Julieta spent at the store.
conversations.from: assistant
conversations.value: Initially, a backpack cost was $50; when it increased by $5, the price became $50+$5 = $55
  The price of a ring-binder $20, when it reduced by $2, the price became $20-$2 = $18
  If she wanted to buy 3 ring-binders, she spent $18*3 = $54
  In total, Julieta spent $55+$54 = $109