Article 5. The unempolyment allowance shall be calculated on the basis of the quotient of the total amount, of wages divided by the number of all days during the two previous months of covered employment for which wages were paid, last month and the month-prior to that month before the separation in which the claimant was paid for 11 or more days of employment (in the case of being separated on the last day of the month, that month shall be used together with the next prior month of a minimum of 11 days of covered employment in the calculation). However, in case the wage paid in the last completed month is higher than that of the previous month on account of the wage raised according to laws, ordinance, orders, etc., or labor contracts or rules of employment, unemployment allowance shall be calculated on the basis of the quotient of the total amount of the wage paid in the last completed month divided by the number of all days during that period.