In case the term of the enterprise is known in advance, the insured employer, irrespective of the provisions of the preceding paragraph, shall report the estimated amount of premium by 10 days before the effective date of the insurance (or by the effective date of the insurance, in case there is a special reason). The estimated amount of the premium shall be calculated by multiplying the estimated total wages of all employees during the expected term of the enterprise by premium rate, plus other charges required by Ordinance. The estimated amount of premium shall be paid within 14 days from the effective date of the insurance.