Creating Rate Table

Hi Gurus,

I have the following requirement.

Rate table has to be prepared based on 2 criteria.

1. Distance Travelled.

2. Cargo Quantity

For ex: If a Truck travels 1000 kms with 50 Ton cargo,

then the price is calculated as 1000*50*20 (where 20 is the rate per km)

How this can be implemented in a rate table.

Distance - Consider I have only 4 Distance slabs - i.e  Scales - 100, 500, 700, 1000 KM

Quantity - Whatever quantity is transported.

Price - 20, 18, 16, 15 for the above 4 distance scales.

How Rate table / calculation sheet prepared for the above requirement,

Any Help appreciated. Thanks.