6. Section 5 of the principal enactment is hereby amended in subsection (2) of that section, by the substitution for paragraph (ii) of the proviso to that subsection, 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, 1989
| | | (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, 1891
| | | (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 or before November 15, 1992, |
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