Old Treadmill Incline question

I have an old York Pacer 2750 treadmill which has 3 manual incline settings....the first one is level, so what percentage incline would you guess the other two settings to be? 5% and 10% or something else?

I can't find any info about this, the manual just says it has manual incline adjustments or something but doesn't give a %.

Is there a way to calculate it somehow?

Thanks for your thoughts. :smile:

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