; and (B) in the case of a determination for each subsequent quarterly installment, during the quarter immediately preceding the quarter for which the installment is provided. (c) Amount of emergency impact aid (1) Aid to State educational agencies (A) In general The amount of emergency impact aid received by a State educational agency for the 2017–2018 school year shall equal the product of— (i) the increase (if any) in the total number of immigrant students— (I) as determined by the eligible local educational agencies and eligible BIA-funded schools in the State under subsection (b)(2); over (II) the number of such students enrolled in such State during the corresponding quarter of the 2015–2016 school year