3. (4 points) Write Python function code that satisfy the following conditions. 1) Name the function as MyFunction. 2) The function has one argument, name it n. (a) Given an integer n, if n is less than 21 then return the difference between n and 21 . (b) if n is equal or over 21 then return double the difference between n and 21 . 'Hint: Your code should return 2 when n=19 and return 8 when n=25. What will the code return when n=30