1/10 would be correct.
Quote:
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The penalty for any dead-ball foul (including live-ball fouls treated as dead-ball fouls) that occurs after a series ends and before the ball is ready for play shall be completed before the line to gain is established.
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As stated above, this is a dead ball foul for delay and since the succeeding spot is a first down spot for a new series, it stays 1/10. This is just like a dead ball foul after a team gains a first down -- if its on A, its first and ten, not first and 25 (for a PF/USC/etc.).
Keep in mind this is unique to a first down play. Had it been another down, the line to gain does not change.