I wouldn’t get too hung up on numbers or percentages. Bring your best negotiating skills and say no - and actually get up to leave - at least once or twice. Push really hard and then just decide if you can live with the deal in front of you. It’s hard to keep your emotions in check after you’ve been at it for an hour or so but you’ll pay more if you don’t. You can always call them back the next day.... good luck..
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