Suppose a month ago, total deposit collected by the banking system was 100 billion and total required reserve of the banking system was 10 billion. Now deposit has increased to 150 billion and total...

Suppose a month ago, total deposit collected by the banking system was 100 billion and total required reserve of the banking system was 10 billion. Now deposit has increased to 150 billion and total required reserve is 15 billion. Determine the maximum change in money supply.