Out of learning and earning what do you prefer most?
Through this question, it would be assessed if you are most consistent with improving your skills and knowledge or you are more inclined with making money. Make one thing clear if you are looking to work at Google you have to convince the recruiters that you will be committed with improvement and knowledge gain. Under the same circumstances money-making will not be an issue, hence come off with an answer where you got to say paying attention to the income is also mandatory. Present an answer having the balance of both at once.