It appears that the group fee is defined by the following expression:
fee = 40 + ( group x 10 )
Can you verify?
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Unfortunately it is not as easy. It is a non-linear fee structure which changes every year (potentially month) depending on currency value etc.
It is a non-linear fee structure which changes every year (potentially month)
You should not be using a calculation for this, because fees change. Instead, define a table of Groups and lookup the fee from there using a relationship based on matching group.