In the event of the Gross Profit earned during any annual period of insurance (or during the accounting period of 12 months more nearly concurrent with any period of insurance) as certified by the insured’s Auditors being greater than the sum insured thereon, the insured will be held covered to the extent of 15% of the sum insured thereof and prorata additional premium not exceeding 15% of the premium pald on such Sum Insured for such period of insurance will be charged in respect of the difference.
