(1) Where for an accounting period of a company the profit ratio of the company in relation to a taxable field is equal to 1.5 or more, an additional duty of corporation tax (in this Chapter referred to as a 'profit resource rent tax') shall be charged on the profits of the company in accordance with the provisions of this Chapter.
(2) Profit resource rent tax shall be charged on the profits to which this Chapter applies of a company for an accounting period at the rate of -
(a) 5 per cent, where the profit ratio is less than 3,
(b) 10 per cent, where the profit ratio is equal to or greater than 3 and less than 4.5,
(c) 15 per cent, where the profit ratio is equal to or greater than 4.5.
(3) The profits to which this Chapter applies as respects any taxable field for an accounting period of a company shall -
(a) in respect of any accounting period in relation to which -
(i) the profit ratio is equal to or greater than 1.5, and
(ii) the profit ratio for the immediately preceding accounti
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