Hi Nikhil,
As discussed in Deccan Cements thread. Cement companies are normally valued on EV per tonne basis and not on PE basis because of earnings fluctuations. Enterprise Value per Tonne suggests roughly how much it would take for someone to set up a given cement capacity. Normally it takes around 130-140$ per tonne to establish a new plant and therefore is used as a comparable number.
Regards,
Haresh.