Nespresso capsules comissions for sellers?

So, I've been talking to some sellers on major comercial areas, and they told me that they don't make any comissions on the coffee machines they sell, but only on the capsules that the costumer buys with it.
Can someone tell me what % of that comissions is? Need it to make a study for uni, and don't want to be rude by asking to someone on the street or something like that.
Can't find anything online.

Thanks.

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