Ah, New Adult. The category that has been something of a lost soul yet is finding readers from YA through adult.
Since it’s still such a foundling in the U.S. publishing market, information is scarce. But generally you can consider the typical range to be between $20,000 and $100,000…as good as YA and standard adult novels across the industry (that is, not solely from the Big Five, which tend to pay more).
See other post about advances for YA authors and adult authors to better understand where New Adult fits and how the average advances stack up against each other.