六条记录的金额
清洗后剩 6 条。运行程序，看每条的金额和合计：
rows = [("东门", 10, 2.0), ("东门", 8, 3.0), ("西门", 0, 2.5), ("西门", 10, 2.0), ("北门", 4, 2.5), ("西门", 6, 3.0)]
amounts = [q * p for _, q, p in rows]
print(",".join(str(int(a)) for a in amounts) + "/" + str(int(sum(amounts))))
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