Answer:
with the third doubling, the AVC = $9.11 per unit
Explanation:
The average variable cost (AVC) decreases by 10% with each doubling of cumulative output:
Production level in units AVC per unit
1,000 $12.50 per unit
2,000 $11.25 per unit
3,000 $10.13 per unit
4,000 $9.11 per unit