Calculation of accessorial costs based on sum base cost and other accessorial cost

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Hi All,

I have a requirement where 2 different accessorial costs needs to be calculated on the sum of base cost and one accessorial cost.

Accessorial 1 - 5% of base cost
Accessorial 2 - 10% of (base+ accessorial 1)
Accessorial 3 - 5% of (base+ accessorial 1)

I have tried configuring the accessorial cost using basis of shipment cost (at the current stage of rating) and using charge sequence but it didn't suffice my requirement as it calculates the 3rd accessorial based on sum of the 2 accessorial cost and base cost.

Please let me know how i need to configure my accessorial cost calculation basis or is there any other way of configuring the mentioned requirement.