service tax liability for an agent

Hi friendzz,

Kindly suggest.

If i have a brand show room and i run it on behalf of the brand, for which i get say Rs.100000.00 as running and maintainance of the store and Rs.50000.00 above that as my fixed comission. also in addition to fixed comission  i recieve comission on sale which varies in quantum  with sale ,say Rs.60000.00

So the cheque tht i recieve from the company is for Rs.210000.00 incl of all taxes ,

My question is, on what amount do i need to pay service tax on?

a) 210000.00

         or

B)110000.00