A salted fishapos;s

"Youngster, I haven't seen you around before. Where are you from",Old Two: "Elder, I can't come here for nothing. You order me some first, alright Let's order some for both our families. When I get back, I'll ask around. We have a few hundred households there. Even if we don't use it for building houses, we all need kang beds. You see, the more we order, the cheaper it can be, right",The old man said, "It depends on how many houses you want to build. Six houses would cost about 40,000, three houses around 20,000. How many houses are you planning to build"。