I am not able to solve the question in demographic data analyzer

Please help me in this one
What country has the highest percentage of people that earn >50K?
Please I really need your help guys.
Thanks in advance.

what’s your code? what have you tried so far?

Actually the problem is I am new to data analysis & hence have no idea on how to tackle this problem.
That is why I want if I could see a model solution so that I could learn from it.