You should probably ask which is valuable, a catty of gold or a catty of RMB.

So from this point of view, now 10 is a catty, and one or two equals 50 grams, so a catty of gold is 10*50=500 grams. Gold futures price is 3 15 yuan/gram 500*3 15= 157500 yuan.

The weight of RMB 100 from Zhang Gang is 1. 15g, 500g per catty. After calculation, a kilo is about 435 RMB 435* 100=43500.

Of course, gold is ancient and valuable.