The boss then said:

“When I do business outside, I can roast about two jin (1 kg) a day. At home, I use less charcoal and can roast about one jin (0.5 kg).

On ordinary days, it can also be used for cooking, consuming a little over a pound. So, all things considered, it would probably use about five pounds a day.

Zhu Yunwen said, "Five jin isn't much, so it shouldn't be a problem."

The shop owner smiled and said:

“Young master, your words are superfluous. We only roast five catties today, and two hundred coins could buy a thousand catties. We only use one coin of coal today. With that one coin, we can earn it in no time by doing something else.”

Zhu Yunwen smiled with satisfaction, then selected a hairpin and asked the shopkeeper:

How much is this hairpin?

The shopkeeper glanced at it and casually said, "Three coins!"

Zhu Yunwen nodded, patted himself down, then looked embarrassed and gave a wry smile, saying:

"I should have gotten some copper coins from them when I went out earlier."

Zhao Qingzhu smiled and took out three copper coins from her pocket and gave them to the shopkeeper.

Zhu Yunwen didn't think anything of it, and handed the hairpin to Zhao Qingzhu, saying:

"I think this hairpin is quite nice. Do you like it?"

Zhao Qingzhu nodded and said, "I do like it."

"Very good, thank you."

He then put it on his head, which surprised the boss sitting next to him. The boss looked at Zhu Yunwen and said:

"Young master is quite something. You spend this girl's money, give her gifts, and she even thanks you."

Zhu Yunwen awkwardly touched his nose, then said apologetically to Zhao Qingzhu:

"I'll go shopping with you next time, and I'll try to bring some money."

Zhao Qingzhu was naturally not angry; she simply said seriously:

"I'm already very grateful that you have time to go shopping with me."

These words made Zhu Yunwen even more embarrassed.