Final answer:
The Oregon subtraction for gambling is the Oregon lottery expense, which is $150, as only the losses related to Oregon lottery tickets can be considered for the state subtraction.
Step-by-step explanation:
The question pertains to the calculation of an Oregon subtraction related to gambling winnings and losses. Based on the information provided, gambling winnings claimed on the federal return were $1000, which includes two Oregon lottery tickets that won $300 each. Gambling losses of $750 were claimed on Schedule A, out of which $150 was an Oregon lottery expense.
To calculate the Oregon subtraction, we only consider the Oregon lottery part of the winnings and losses. Since the Oregon lottery winnings were $600 (2 tickets x $300 each) and the Oregon lottery expense was $150, the subtraction would be just the Oregon lottery expense because the winnings are included in the federal return and the losses are already accounted for in Schedule A. Therefore, the correct answer to how much the Oregon subtraction is would be $150.