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WINNER!
Bob went to a shop to make a purchase. He asked the assistant "How much will one cost?" The assistant thought for a moment and said, "three dollars." Bob looked a little puzzled and said "well then, how much will twelve cost?" "Six dollars," replied the clerk. Bob scratched his head and said, "if I were to purchase two hundred, how much would that cost?" "That," said the clerk, "will cost you nine dollars." What was Bob buying?