(a) If, for a bonus year, none of the eligible States is Guam, American Samoa or the Virgin Islands, then the amount of the grant shall be:

(1) $20 million per State if there are five eligible States; or

(2) $25 million per State if there are fewer than five eligible States.

(b) If for a bonus year, Guam, the Virgin Islands, or American Samoa is an eligible State, then the amount of the grant shall be:

(1) In the case of such a State, 25 percent of the mandatory ceiling amount as defined in section 1108 of the Act; and

(2) In the case of any other State, $100 million, minus the total amount of any bonuses paid to Guam, the Virgin Islands, and American Samoa, and divided by the number of eligible States other than Guam, American Samoa and the Virgin Islands, not to exceed $25 million per State.