Teacher Mo replied, "One box is one box. These items are directly ordered by our school, and they're not expensive. Since they're consumables, they come in one hundred bags per box. How many needles are in one set of yours?"
Manbao said, "Ninety. I have ten needles for each type, but there are different ones, such as Doctor Ji, who has one hundred and twenty needles in his package. Each doctor prepares needles according to his own preferences. Teacher Mo, don't you do the same?"
Teacher Mo said, "No, we use one bag and discard it after use. Each bag contains one hundred needles."
Manbao was stunned, "Use one pack and throw it away?"
Teacher Mo confirmed, "Exactly!"
Manbao then recalled the time when she wanted to buy a set of needles. Her father had fretted over it for a long time before her mother agreed to pay for them. Once he knew she could afford them herself, he happily took the money back, but he still winced at how much she had spent on them.
