(2)For the purposes of sub-section (1), the tonnage income of each qualifying ship shall be computed as per the following formula:––TI= DTI x Nwhere,—TI = the tonnage income of each qualifying ship;DTI = the daily tonnage income of each qualifying ship;N = the number of days in the tax year or in part of the tax year in case the ship is operated by the company as a qualifying ship for only part of the tax year.