Article 5. The amount of money to be compensated under A class insurance, the insured person of which is an exporter, by the insurance company shall be the amount of money obtained by multiplying by the ratio as may be fixed, within the limit of 80%, by Cabinet Order the balance between the sum, which is part of the prices fixed by the export contract for the export goods concerned, the exporter has been unable to receive due to any of the causes mentioned in items of Article 3 and the amounts mentioned in the following items (in case it is fixed at the time of conclusion of the contract that increases which have come to be paid by the exporter, in freight or insurance premium for marine, from change in voyage or deviation from the route due to the said cause is to be compensated:the aggregate of the said balance and the said increases);provided, however, that the said amount may not exceed the amount insured: