New Delhi: By the time you read this, the price of petrol would have gone up by more than Rs 7.50 a litre across the country. The increase, the steepest-ever, came a day after Parliament’s Budget session ended and PM Manmohan Singh talked about the need for “difficult decisions”. After adding state taxes, petrol will cost Rs 73.18 a litre in Delhi, Rs 78.57 in Mumbai, Rs 77.88 in Kolkata and Rs 77.53 a litre in Chennai. This marks an increase of around 10% and puts a squeeze of about Rs 6,000 a year on a family that spends an average of Rs 5,000 per month on petrol.