(7)Notwithstanding anything contained in sub-section (1), where the assessee referred to therein, is a unit located in an International Financial Services Centre and derives its income solely in convertible foreign exchange, the provisions of sub-section (1) shall have the effect as if for the words "eighteen and one-half per cent" wherever occurring in that sub-section, the words "nine per cent" had been substituted.Explanation.—For the purposes of this sub-section,—(a)"International Financial Services Centre" shall have the same meaning as assigned to it in clause (q) of section 2 of the Special Economic Zones Act, 2005 (28 of 2005);(b)"unit" means a unit established in an International Financial Services Centre;(c)"convertible foreign exchange" means a foreign exchange which is for the time being treated by the Reserve Bank of India as convertible foreign exchange for the purposes of the Foreign Exchange Management Act, 1999 (42 of 1999) and the rules made thereunder.