(B) In ascertaining and determining the gross receipts of each public utility subject to this section, the following gross receipts are excluded:

1. (1) All receipts derived wholly from interstate business;
2. (2) All receipts derived wholly from business done for or with the federal government;
3. (3) All receipts from the sale of merchandise;
4. (4) All receipts from sales to other public utilities, except railroad and telegraph companies, for resale, provided the other public utility is subject to the tax levied by section 5727.24 or 5727.30 of the Revised Code.

(F) The amount ascertained under this section, less the following deduction, shall be the taxable gross receipts of a natural gas company or combined company subject to the tax imposed by section 5727.24 of the Revised Code for business done within this state:

1. (1) For a natural gas company that files quarterly returns of the tax imposed by section 5727.24 of the Revised Code, six thousand two hundred fifty dollars for each quarterly return;
2. (2) For a natural gas company that files an annual return of the tax imposed by section 5727.24 of the Revised Code, twenty-five thousand dollars for each annual return;
3. (3) For a combined company, twenty-five thousand dollars on the annual statement filed under section 5727.31 of the Revised Code. A combined company shall not be entitled to a deduction in computing gross receipts subject to the tax imposed by section 5727.24 of the Revised Code.