(a) Any amount required to be included in a report may be entered at the nearest whole dollar amount. This does not apply to the items which must be taken into account in making the computations necessary to determine such amount. For example, each sale must be taken into account at its exact amount, including cents, in computing the amount of business receipts to be included in the franchise tax report. However, the total amount of business receipts to be included in the franchise tax report may be entered at the nearest whole dollar amount. A taxpayer may elect not to use whole dollar amounts by reporting all amounts in full, including cents, if a similar election is made for Federal income tax purposes. Such election must be made at the time of filing the report and is irrevocable with respect to the taxable year covered by the report. A new election may be made on any report for any subsequent taxable year.

(b) For the purpose of the computation to the nearest dollar, a fractional part of a dollar shall be disregarded unless it amounts to one-half dollar or more, in which case the amount (determined without regard to the fractional part of a dollar) shall be increased by one dollar.