The Secretary shall determine the maximum amount of each grant under this section. (e) Federal share The Federal share of a grant under this section shall not exceed 90 percent of the costs of carrying out the activities described in subsection (c). (f) Supplement, not supplant An institution of higher education shall use a grant received under this section only to supplement funds that would, in the absence of such grant, be made available from other Federal, State, or local sources for activities supported by the grant, not to supplant such funds. 3. Definitions In this Act— (1) The term eligible entity means a public institution or public facility, including— (A) an elementary school