State-owned Indian Oil Corp (IOC) on Tuesday reported a 29 per cent jump in its third quarter net profit on the back of higher refinery margins and inventory gains. Following the Government diktat to pay additional dividend to make up for shortfall in disinvestment proceeds, the board of IOC declared an interim dividend of 135 per cent (Rs 13.5 per share). Net profit in October-December quarter at Rs 3,994.91 crore, or Rs 8.43 per share, was 29 per cent higher than Rs 3,095.75 crore, or Rs 6.53 a share, in the same period a year ago. The IOC earned $7.79 on turning every barrel of crude oil into fuel in the third quarter as compared to a gross refining margin (GRM) of $5.96 in the same period of the previous fiscal, IOC Chairman B Ashok told reporters here.