Section 6. Securities in Class "c" Shall Comprise the Following:

Those issued by a person, corporation, firm, trust, partnership or association owning a property, business or industry, which has been in continuous operation not less than two years and which has shown net profits, exclusive of all prior charges, as follows:

(1) In the case of interest-bearing securities not less than one and one-half times the annual interest charge upon all outstanding interest-bearing obligations;

(2) In the case of preferred stock not less than one and one-half times the annual dividend on such preferred stock;

(3) In the case of common stock not less than 3% per annum upon such common stock.