conversations.from: human
conversations.value: A spiral notebook costs $15, and a personal planner costs $10. How much would it cost in total to buy 4 spiral notebooks and 8 personal planners at a 20% discount?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: If a spiral notebook cost $15, a 20% discount would reduce the price by 20/100 *15 = $3
  At a 20% discount, the buying price of a spiral notebook book is $15-$3= $12
  At the same discount, a personal planner cost would reduce by 20/100 * $10 = $2
  The new buying price of a personal planner will be $10-$2 =$8
  To buy four spiral notebooks at a 20% discount, you'll pay 4*$12 = $48
  At the same time discount, you'll buy eight personal planners at a cost pf 8*$8 = 64
  In total, to buy eight personal planners and four spiral notebooks, you'd have to pay $64+$48 = $112