There is no rule; both are acceptable. In American English at least, it is common to speak 4-digit numbers with the last two digits zeros as 'hundred's: 1100 -- eleven hundred 9900 -- ninety-nine hundred.
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Mister Micawber .I realize this way of reading numbers is just a custom or because it is easier to pronounce long numbers.
There is no rule; both are acceptable. In American English at least, it is common to speak 4-digit numbers with the last two digits zeros as 'hundred's:
1100 -- eleven hundred
9900 -- ninety-nine hundred.
.