It is 100%. Your NY state refund is entirely based on New York source income, because you filed a nonresident return with New York. If the situation were reversed (asking about a NJ refund), the amount of the refund is affected by the amount of credit that NJ gives for the tax you pay to NY on that income. But in this case, the question is how much of the NY state refund is from New York Sources. The answer is all of it.
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