Please help with these 3 questions

You also have the option to build a seawall to lower the odds of your house being destroyed by a flood. If the seawall makes the likelihood of the destructive flood become once every 80 years, what should be your insurance premium? Question 6 2 pts Consider a bank policy to hold reserves equal to 15% of bank deposits. The bank currently has $25 million in deposits and $1 million in excess reserves. What is the required reserve on a new deposit of $800,000 ? Please answer in dollars. Question 7 2 pts If the Fed decides to conduct contractionary monetary policy by selling $250 million in UST bonds. how much will the money supply change if the required reserve ratio is 12% ? Please express your answer in millions of dollars. Be sure to include the negative sign if the money supply shrinks