Hike in petrol prices, diesel unchanged New Delhi: In relief to transport sector, OMCs raised petrol prices as global cues pushed fuel prices up across the country on Friday adding to common man''s misery, even as he already grapples with high food prices amid shrinking income. But this time round, the oil companies have only increased the pump price of petrol while keeping diesel rates unchanged to limit the cascading effect of high transport fuel on prices of various other commodities. Accordingly, the retail price of petrol increased by 35 paise per litre in the national capital on Friday to Rs 99.16 while diesel prices maintained previous days price line of Rs 89.18 a litre. With the rise, petrol prices have reached very close to hitting the century mark all across the country extending the scope of historic high prices that had already made the fuel rate cross the Rs 100 per litre mark in certain cities and towns of Maharashtra, Madhya Pradesh, Rajasthan, Telangana, Andhra Pradesh. The latest price rise has also brought Chennai in the list of metro cities hitting the century mark with petrol.