Prior work penalty doubles every anvil use — this adds it up correctly so you know the real cost before you commit levels.
+0 lvl
+0 lvl
Enchantments Being Applied
Enchantment cost0
Target penalty0
Sacrifice penalty0
Repair0
Rename0
Total cost0 levels
⚠ Too Expensive! — exceeds the 39-level survival cap
Penalty by uses:
0→01→12→33→74→155→316→63