The total sum of the following:

(a) The sum of the ongoing revenues as defined in section 3 (b) from the conclusion of the establishment period until the conclusion of the tax year with respect to which the levy coefficient is calculated, with the addition of linkage differentials from the conclusion of the tax year wherein any revenue was received until the conclusion of the tax year with respect whereto the levy coefficient is calculated;

(b) If the exploration revenues as defined in sub-section (2) exceed the exploration investments as defined in the same sub-section, during the exploration period – the sum of the difference between the exploration revenues and the exploration investments, as aforesaid, with the addition of linkage differentials from the conclusion of the tax year wherein the date of the commencement of commercial production began until the conclusion of the tax year with respect whereto the levy coefficient is being calculated;

(c) If the establishment revenues, as defined in sub-section (2) exceed the establishment investments as defined in the same sub-section, during the establishment period – the sum of the difference between the establishment revenues and the establishment investments, as aforesaid, with the addition of linkage differentials from the conclusion of the establishment period until the conclusion of the tax year with respect whereto the levy factor is being calculated;