Vehicle Code § 9559

In computing any registration or weight fee or penalty imposed by this code, whether on a proration or otherwise, a fraction of a dollar is disregarded, unless it equals or exceeds fifty cents ($0.50), in which case it is treated as one full dollar ($1). Computation of any penalty shall be made from the fee after the same has been computed as provided in this section.

Any fee or penalty in an amount of forty-nine cents ($0.49) or less shall be deemed to be one dollar ($1).