answer me fast please

A) The central bank has set the minimum reserve ratio for banks at 10%. How large is); he money multiplier? (3 Points) B) The central bank purchases securities in the open market in the amount of 10 billion euros. Does this lead to an increase or decrease in the money supply? What is the maximum possible change in money supply taking into account the result from subtask (A)? (5 Points) C) Specify for the following 4 cases how and by which amount the money supply changes take into account the result from subtask (A). {10 Points) Case Change in the Amount of the money supply money supply "increase", change (in IE). "decrease" or ("0" in case of "no change". no change) (i) Bank A grants a credit of 5000052 to the Export Inc. (ii) The Export Inc pays the 50.000 to a mechanical engineer and in return receives a new machine. (iii) The mechanical engineer grants a credit of 30,000 to one of its employees. (iv) The mechanical engineer pays the remaining 20.000 into bank B, which in turn grants this amount as a credit to bank C