How much will it cost to replace a rack and pinion on a '92 Honda Accord?

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Hi, I am trying to buy a 1992 Honda Accord and the seller has informed me that the power steering fluid leaks from time to time and he adds some when needed and says he may use a 12 oz. bottle a month. He's not sure if it's just a leak or if the rack and pinion will need to be replaced, which is very costly he explained. Can I easily tell which needs to be done? And how much will the rack and pinion repair cost? I'm getting the car for a great price and would just like to know if it will be worth it all. Thanks!