Sales percentage


I have the following problem for a salesman. If he sale the product with 20% mark-up he will earn 5% commission and so on based on the below plan…How can I get an average to interpolate if he sales for example with 38% mark-up?

These are the values

Markup    Commission
A             B
20           5
35          10
50          15
65          20

By: Serginio

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