Given this context:
"Would love to offer you the job. At least 2.5× what you're on."
What does "what you're on" mean in this sentence? The person's current wage?
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Certainly in a British English setting, and in this context (employment/salary/payment for work done), "what you are on" means "your current salary, or annual, monthly, daily, hourly (etc) pay rate".
The 'X' in '2.5 X' should be read as 'times' and in mathematical material will be the multiplication sign × which is not identical with the letter X or x in the alphabet.
Let's talk about payment. What are you on at your job?
I'm on £30,000 per year.
We'd like to offer you a salary of 2.5 times what you're on - £75,000 per year.
I'm on £20 per hour.
We'd like to offer you 2.5 times what you're on - £50 per hour.