Answer and Explanation:
The computation of the taxable income in each states is shown below:
a. For state 1
= Apportionable income ÷ number of states
= $555,000 ÷ 3
= $185,000
b. For state 2
= Apportionable income ÷ number of states
= $555,000 ÷ 3
= $185,000
c. For state 3
= $185,000 + $75,000
= $260,000