The corresponding corporation tax in the State of a controlled foreign company for an accounting period shall be the sum of -
(a) the corporation tax that would be charged at the rate specified in section 21(1)(f) on that part of the corresponding chargeable profits in the State for the accounting period which would consist of profits chargeable to tax under Case I or II of Schedule D,
(b) the corporation tax that would be charged at the rate specified in section 21A(3) on that part of the corresponding chargeable profits in the State for the accounting period which would consist of profits which would be chargeable to tax under Case III, IV or V of Schedule D, and
(c) the capital gains tax that would, in accordance with section 78 or otherwise, be charged on that part of the corresponding chargeable profits in the State for the accounting period which would consist of chargeable gains,
if, for the purpose only of determining under which Case of Schedule D the corresponding chargeable
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