Answer:
$36,000
Step-by-step explanation:
Temporary duty can't change anything when someone is domiciled in the state and a responsible resident of the state, therefore his whole income would be taxable as usual whether he is in the state or out of state.
Workings:
Financial year= 12 months
Monthly salary = $3,000
Taxable income= $3,000 x 12 months
Taxable income = $36,000