#13, anyone?

13) A small economy increased its capital per hour worked (K/L) from $40,000 to $50,000. As a result, 13 real GDP per worker (Y/L) grew from $20,000 to $25,000. If the economy wants to further increase its real GDP per worker (Y/L) to $30,000, by how much must it increase its capital per hour worked (K/L) (assuming that there is no change in technology)? A) by more than $10,000. B) by $10,000. C) by less than $10,000