A tax is hereby imposed upon the taxable income of every domestic and foreign corporation which must be levied, collected, and paid annually as in this chapter provided:
1. For the first twenty-five thousand dollars of taxable income, at the rate of one and forty-one hundredths percent.
2. On all taxable income exceeding twenty-five thousand dollars and not exceeding fifty thousand dollars, at the rate of three and fifty-five hundredths percent.
3. On all taxable income exceeding fifty thousand dollars, at the rate of four and thirty-one hundredths percent.