One catty is twelve taels, which is also 100 yuan, so six catties is 600 yuan! @

This should be the correct answer! Obviously this is a brain teaser! Ha ha!

If it is the old system, then a kilo is 16, which is 960 yuan!

And if you consider it according to geometric series! Then the ratio should be 0. 1! So 6 kg is 1.2 yuan!