5,000 dollars. He must generate about 5,000 dollars per week for the commission to be the better choice. Don't quote me however. But I believe this is the answer.
Cause he gets a base salary of 400.00 plus the 0.08 commision (8%)
He would need at least 5,000 in sales to get 8 percent which would be 400, making his salary
400+400 = 800, better than the other option of 750