All your examples are unremarkable as regards "average", but I think I should mention that "inquiry" is usual in America, most numbers of more than three digits take commas here (1,000 and 12,000), and our accountants earn dollars, not pounds sterling (insert appropriate smiley here). This use of "average" rings of business-speak, but not so much that people don't say it. It is the usual way of expressing what a job pays.
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youzouBut, what about average?I thought I covered "average". The use of "average" in your examples is good American English.