The Insurance is on increased value of cargo by reason of payment of customs duty at destination and is subject to the same clauses and conditions as the Insurance on cargo and pays the same percentage of loss as may be paid thereon. In ascertaining the amount of claim recoverable under the Duty Policy, credit shall be given for any rebates or refund of duty which may become allowable. Claims are payable on the basis of actual duty paid or on the basis of the sum insured, whichever is loss. The sum insured for duty shall be adjusted on the basis of actual assessed duty and the Policy shall be one of pure indemnity and not an agreed value Policy.