"Sec. 24. Rate of tax on corporations. � There shall be levied, assessed, collected, and paid annually upon the total net income received in the preceding taxable year from all sources by every corporation organized in, or existing under the laws of the Philippines, no matter how created or organized, but not including duly registered general co-partnerships (compaas colectivas) a tax upon such income equal to the sum of the following:

"Twenty per centum upon the amount by which such total income does not exceed one hundred thousand pesos; and

"Twenty-eight per centum upon the amount by which such total net income exceeds one hundred thousand pesos; and a like tax shall be levied, assessed, collected, and paid annually upon the total from all sources within the Philippines by every corporation organized, authorized, or existing under the laws of any foreign country; Provided, however, That building and Loan Associations operating as such in accordance with sections one hundred and seventy-one to one hundred and ninety of the Corporation Law, as amended, as well as private educational institutions, shall pay a tax of twelve per centum and ten per centum, respectively, on their total net income: And provided, further, That in the case of dividends received by a domestic or resident foreign corporation from a domestic corporation liable to tax under this Chapter or from a domestic corporation engaged in new and necessary industry, as defined under Republic Act Numbered Nine hundred and one, only twenty-five per centum thereof shall be returnable for purposes of the tax imposed by this section."