CREATE OR REPLACE FUNCTION GET_PERCENT (V_ARG1 NUMBER, V_ARG2 INT)
RETURN VARCHAR2
IS
V_RESULT VARCHAR2(100);
BEGIN
  IF (V_ARG2 IS NULL) THEN
V_RESULT := TO_CHAR(ROUND(V_ARG1*100,2))||'%';
ELSE
V_RESULT := TO_CHAR(ROUND(V_ARG1*100,V_ARG2))||'%';
END IF;
RETURN V_RESULT;
END;