"Sister, what can you and Professor Qin exchange for?" The two elderly people only have useless things in their house.

"Antiques? What, are you jealous of those two old people?" Lin Yue said coldly.

"No, how could I be that kind of person? But sis, if you want to trade antiques, we have plenty. Do you want to trade some?" Antiques are useless now; they can't be eaten, used, or traded.

"Get this done first. Tell me the price." She doesn't like wasting time talking to people these days.

"Alright! Sis, our boss said he has what you need, but it's a bit difficult to get and a little pricey." Li Mazi said with a grin.

"What would you like to change to?" If it was suitable, she would change it.

They went to the government service hall yesterday to inquire. The documents are available, but they require multiple levels of approval, and it will take at least two months to be approved.

Two months later, the daylilies were already too cold.

"Doors are priced by the jin (a unit of weight), glass by the square meter, sand by the cubic meter, cement by the bag, and bricks by the piece. You can exchange them for grain or other things." Li Mazi coughed and continued, "If you use grain, good rice is five jin per jin for a door, and inferior rice is eight jin. Glass is thirty jin per square meter of good rice, and forty-five jin per square meter of inferior rice. Sand is eight jin per cubic meter of good rice, and ten jin per square meter of inferior rice. Cement is twenty jin per bag of good rice, and thirty jin per bag of inferior rice. Bricks are cheap, one brick is one liang (a unit of weight) per piece of good rice, and two liang (a unit of weight) per piece of inferior rice."

As Li Mazi spoke, Cang Yu and Lin Yue were both quickly calculating in their minds.

The two ordinary gates of the courtyard weigh at least two or three hundred pounds, but the gates they wanted were specially made, each weighing at least five hundred pounds. Just the gates alone would require five thousand pounds of rice as a base.