6. Section 5 of the principal enactment is hereby amended in subsection (2) of that section, by the repeal of paragraph (ii) of the proviso to that subsection, and the substitution therefor of the following paragraph: "
"(ii) where any person who is liable to pay the surcharge under this Act for a relevant year pays as such surcharge"
| | (a) for the relevant year commencing on April 1.
| | | (i) not less than 7 1/2 per centum on or before August 15, 1989, and |
| (ii) not less than 7 1/2 per centum on or before November 15, 1989, |
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| | (b) for the relevant year commencing on April 1, 1990"
| | | (i) not less than 7 1/2 per centum on or before August 15, 1990, and |
| (ii) not less than 7 1/2 per centum on or before November 15, 1990, |
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| | (c) for the relevant year commencing on April 1, 1991"
| | | (i) not less than 7 1/2 per centum on or before August 15, 1991, and |
| (ii) not less than 7 1/2 per centum on or before November 15, 1991. |
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| | (d) for the relevant year commencing on April 1. 1992"
| | | (i) not less than 7 1/2 per centum on or before August 15, 1992, and |
| (ii) not less than 7 1/2 per centum on of before November 15, 1992, |
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| | (e) for the relevant year commencing on April 1. 1993"
| | | (i) not less than 7 1/2 per centum on or before August 15, 1993, and |
| (ii) not less than 7 1/2 per centum on or before November 15, 1993, |
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| | (f) for the relevant year commencing on April 1, 1994"
| | | (i) not less than 7 1/2 per centum on or before August 15, 1994, and |
| (ii) not less than 7 1/2 per centum on or before November 15, 1994, |
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