(a) A professional employee of the Department of Education having the qualifications required by the certifying board shall receive as an annual salary the amount for which that professional employee’s qualifies under § 1316 of this title and the schedule set forth in § 1305(a), (b) and (d) of this title, plus an annual amount for administrative responsibility. The amount for administrative responsibility is to be determined in accordance with either the following schedule or by multiplying the amount provided under § 1305(a), (b) and (d) of this title by the index value specified in the second schedule that corresponds with the appropriate classification and experience level, whichever is greater.