Got a Difficult Percent Problem?

Question

Do you know an extremely difficult percent problem?
If so I want to hear it! The most difficult will get best answer!

Answer 1

Here is the question you are looking for:
x people got $350000 salary.
1/2 of them got 25% of total amount.
1/3 will get 1/3 of the total amount.
1/12 will get half of remaining percentage of amount.
1 will get the amount left.
find X

Answer 2

suppose you have a morgage for 30 years at a 5% annual interest rate,
calculate your monthly payment.