(a) The operator shall charge fees in accordance with a schedule approved by FTA, which shall include different fees for partial testing.(b) Fees shall be prorated for a vehicle withdrawn from the Bus Testing Facility before the completion of testing.(c) The manufacturer's portion of the test fee shall be used first during the conduct of testing. The operator of the Bus Testing Facility shall obtain approval from FTA prior to continuing testing of each bus model at the Bus testing program's expense after the manufacturer's fee has been expended.