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World scale

It is an international freight index or scale is  for calculating the freight of the oil cargo which is being carried through sea.
It includes expenses such as port fees , transit charges , voyage time and bunker cost.
It is expressed in dollars per tonne.

Uses:
: >It is used for calculating the freight rate for oil tankers and product tankers .
:> It is used as a calculating tool for charterer,  brokers  ,oil refining companies and ship owners .

Note :
Rates are revised annually on the basis of bunker cost , exchange rate and Port charges etc.

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