I know this isn't an exact answer, but my recommendation would be to look at the ads in Dawn (there are usually 8 or so rental firms advertising on Sundays) call around and find the best deal.
Usually they'll try to rent out the car with a driver...opt out of that because 1.) its more expensive, and 2.) I believe with driver rentals, are only for 12-14 hours.
Also specifically ask for an older model; over the phone they'll just tell you the prices for the '13, '14, '15 cars, which can be as much as 30% higher than older cars. e.g. if you wanted to rent a corolla, I would recommend renting the previous iteration, as it'll be substantially cheaper than the current generation. Actually I would offer the same advice for a Civic, go for the older generation and you will save a substantial bit of money.
With regards to price, I don't have any specifics, but don't expect more than RS 3,000 per day (hopefully it'll be much cheaper, closer to 2,000 but its preferable to be underbudget rather than overbudget). You may be able to get a cheaper offer if you commit for the entire week.
If you really want, I can call around this weekend.