The offer will state what the base salary is. If it doesn't, it's not an offer. I don't think there is a limit as such. I negotiated over 10%.

Also any idea what is the cost of an American or British school for grades 1-7.

From what I could gather, as I have not arrived yet, there are 2 American schools and numerous British ones. The two American ones are 50-60k per year. The British ones vary from 21-70k. All schools I contacted were non-committal. They want to assess my kids, at extra cost, then and only if they have their Qatar ID in hands, will they state if they have spaces. The typical reply I got is waiting lists. I heard from schools and online that they must start school by January latest. After that, only in the new school year in August 2022 is allowed. This is the major hindrance at the moment for us. My spouse refuses to pull kids from school here without guaranteed spaces in Qatar.

QP will send out a PDF guide with additional information after you sign the offer papers. Send me a PM if you want to chat further