When an OEM alternative fuel school bus is sold for less (or more) than its MSRP, the amount determined in subparagraph (i) or (ii) of this paragraph (f) shall be proportionately reduced (or increased) by the same percentage as the discount (or premium) on the MSRP, as applicable.
When an OEM alternative fuel motor vehicle is sold for less (or more) than its MSRP, the amount determined in subparagraph (i) or (ii) of this paragraph (e) shall be proportionately reduced (or increased) by the same percentage as the discount (or premium) on the MSRP, as applicable.