Paying duties on a scanner at Pudong Airport

Brought back from Tokyo an Epson X970, basically a Japanese rebadged V700 film and document scanners. Firstly kudos to ANA airlines for handling it properly. I know that they put duties on scanners and many other items in China but there's nothing on the web that specifies how much except I know its 20%. Declared it and was charged 20% or a maximum value of 1000 rmb. Basically whatever your stuff costs its 200 rmb. Of course the maximum value for every type of item is different. So go on, buy your high end stuff and bring them into China.