(a) CertificationThe Secretary shall provide a discount payment to a proposer of a proposal selected under this part for purposes of reimbursing the proposer for a discount provided to the users if the proposer certifies to the Secretary that—
(c) Calculations of discount payments
(1) The discount payment shall be no greater than—
the price differential; or
the price of the comparable conventionally fueled motor vehicle.
The purchase price of the electric motor vehicle, less the discount payment and less any additional reduction in the purchase price of the electric motor vehicle that may result from contributions provided by other parties, may not be less than the manufacturer’s suggested retail price of a comparable conventionally fueled motor vehicle.