Oil and gas producer PT Energi Mega Persada (ENRG) Tbk, controlled by Bakrie Family, booked net loss of US$40.09 million in Jan-Sep 2015 against profit of US$33.24 million in the same period of 2014. It is slightly smaller than fellow oil and gas company PT Medco Energi International (MEDC), but why the gap of gross profit margin with ENRG is so big?To subscribe please click here