Using the information from the prior problem, how much would the bank need to borrow in either the Fed Funds market or at the discount window, to be in compliance with the required reserve ratio?

Suppose a bank currently has $250,000 in deposits and $27,000 in reserves. The required reserve ratio is 10%. If at the end of the day, there is an unexpected withdrawal of $4,000 in reserves, what is the bank's resulting reserve ratio (expressed as a %)