Answer:
Albernia should increase its physical capital per worker to $30,000.
Step-by-step explanation:
Since Albernia and Britannia have the same relationship between physical capital per worker and output per worker (as shown in the attached graph), Albernia must increase physical capital per worker to $30,000. This way, it will match Britannia's physical capital per worker, and worker output should also match (should increase to $40,000) due to the same relationship between the factors of production.