{
  "leg": "C2",
  "item_id": "c2-num-1",
  "category": "arithmetic-date-unit",
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      {
        "role": "user",
        "content": "A club buys 7 double-six domino sets at $12.50 each and pays a flat $9.00 shipping fee on the order. It then returns 2 of the sets and is refunded their purchase price only - the shipping fee is not refunded.\n\nWhat is the club's net cost, in dollars?\n\nWork it out however you like, then end your reply with a final line of exactly this form and nothing after it:\nANSWER: <number>"
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  "answer": "To calculate the club's net cost, we can break the problem down into the initial expenditure and the subsequent refund.\n\n**Step 1: Calculate the initial total cost.**\nThe club buys 7 sets at $12.50 each.\nCost of domino sets = $7 \\times 12.50$\n$7 \\times 12 = 84$\n$7 \\times 0.50 = 3.50$\nTotal cost of sets = $84 + 3.50 = 87.50$\n\nAdd the flat shipping fee of $9.00.\nInitial Total Cost = $87.50 + 9.00 = 96.50$\n\n**Step 2: Calculate the refund amount.**\nThe club returns 2 sets.\nThe refund is for the purchase price only (shipping is not refunded).\nRefund per set = $12.50$\nTotal Refund = $2 \\times 12.50 = 25.00$\n\n**Step 3: Calculate the net cost.**\nNet Cost = Initial Total Cost - Total Refund\nNet Cost = $96.50 - 25.00$\nNet Cost = $71.50$\n\n**Alternative Method:**\nCalculate the cost of the sets kept plus the non-refundable shipping.\nSets kept = $7 - 2 = 5$ sets.\nCost of kept sets = $5 \\times 12.50 = 62.50$\nShipping fee (non-refundable) = $9.00$\nNet Cost = $62.50 + 9.00 = 71.50$\n\nANSWER: 71.50",
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