Then you tell me, how many bricks would it take to build a house asked Lao Er.,“Why aren’t you expensive A hundred catties for just three coins, and once winter arrives, they will sell for five coins.” The old man sighed: “Don’t think my bricks are expensive either; my family only earns a hard-earned living.”,"Charcoal is even more expensive, three coins per hundred jin. In winter, it costs three and a half coins."。