How do you solve this problem?

Steven has applied for a mortgage on a house that he is buying for a purchase price of $236000. He will put 20% down. Steven is concerned that the interest rates may rise by the time the transaction closes in 45 to 60 days. In order to lock in the current low mortgage rate, his lender requires a 0.75% fee. In order to lock in the current interest rate, Steven will have to pay the lender