§ 3. Rate of tax. -- The tax imposed by section two shall be
determined in accordance with the following table:
If the city taxable

income is: The tax is:
Not over $1,000 0.4 % of the city taxable income
Over $ 1,000 but not over $ 4 plus 0.6 % of excess over

$ 3,000 $1,000
Over $ 3,000 but not over $ 16 plus 0.8 % of excess over

$ 6,000 $3,000
Over $ 6,000 but not over $ 40 plus 1.0 % of excess over

$10,000 $6,000
Over $10,000 but not over $ 80 plus 1.2 % of excess over

$15,000 $10,000
Over $15,000 but not over $140 plus 1.4 % of excess over

$20,000 $15,000
Over $20,000 but not over $210 plus 1.6 % of excess over

$25,000 $20,000
Over $25,000 but not over $290 plus 1.8 % of excess over

$30,000 $25,000
Over $30,000 $380 plus 2.0 % of excess over

$30,000