what am i doing wrong?
declare
   cursor inventorycursor is
     select order_Line.o_id,order_Line.oL_quantity,inventory.inv_price
      from inventory
       join order_Line on order_Line.inv_id =inventory.inv_id; 

   cursor order_Linecursor is
     select order_Line.o_id, order_Line.oL_quantity, inventory.inv_price
       from order_Line
         join inventory on inventory.item_id = order_Line.o_id;

      o_id         Number(8);
      item_id      Number(8);
      inv_price    Numeric(10,2);
      oL_quantity  Number(4);
      totamt       Numeric(10,2);
      disamt1      Numeric(10,2);
      disamt2      Numeric(10,2);
    
 begin
        totamt:=(inv_price * oL_quantity);
        IF ( totamt>100)
               THEN
                RETURN(totamt*.10);

                 IF ( totamt>200)
                  THEN
                   RETURN(totamt*.20);
                     ELSE 
                      RETURN (0);
                  END IF;
                 

      open inventoryCursor;
        fetch inventoryCursor into o_id ,oL_quantity,inv_price;
         dbms_output.put_line('Order ID'||' '||' Original.Amt'||' '||' Dis Amt');
          dbms_output.put_line('----------------------------');
             
           while inventoryCursor%FOUND loop
            fetch inventoryCursor into o_id,oL_quantity,inv_price;  
        dbms_output.put_lineo_id||''||inv_price*oL_quantity||''||disamt );  
            end loop;    
          close inventoryCursor;
              end;
     /
ORA-06550: line 44, column 18:
PLS-00103: Encountered the symbol ";" when expecting one of the following:

   if2.    cursor inventorycursor is
3.      select order_Line.o_id,order_Line.oL_quantity,inventory.inv_price
4.       from inventory
5.        join order_Line on order_Line.inv_id =inventory.inv_id; 
6. 
 

I got these errors

PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 24, column 17:
PL/SQL: Statement ignored
ORA-06550: line 28, column 20:
PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 28, column 20:
PL/SQL: Statement ignored
ORA-06550: line 30, column 23:
PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 30, column 23:
PL/SQL: Statement ignored
ORA-06550: line 42, column 1. declare
2.    cursor inventorycursor is
3.      select order_Line.o_id,order_Line.oL_quantity,inventory.inv_price
4.       from inventory
 

I just started 2 weeks ago and pl/sql is just a very small part of the course.Function

declare
   cursor inventorycursor is
     select order_Line.o_id,order_Line.oL_quantity,inventory.inv_price
      from inventory
       join order_Line on order_Line.inv_id =inventory.inv_id; 

   cursor order_Linecursor is
     select order_Line.o_id, order_Line.oL_quantity, inventory.inv_price
       from order_Line
         join inventory on inventory.item_id = order_Line.o_id;

      o_id         Number(8);
      item_id      Number(8);
      inv_price    Numeric(10,2);
      oL_quantity  Number(4);
      totamt       Numeric(10,2);
      disamt1      Numeric(10,2);
      disamt2      Numeric(10,2);

        FUNCTION cal_dis(totamt Numeric)Return Numeric IS
 begin
        totamt:=(inv_price * oL_quantity);
        IF ( totamt>100)
               THEN
                RETURN(totamt*.10);

                 IF ( totamt>200)
                  THEN
                   RETURN(totamt*.20);
                     ELSE 
                      RETURN (0);
                  END IF;
                  END cal_dis ;
                 

      open inventoryCursor;
        fetch inventoryCursor into o_id ,oL_quantity,inv_price;
         dbms_output.put_line('Order ID'||' '||' Original.Amt'||' '||' Dis Amt');
          dbms_output.put_line('------------------------------------------------');
             
           while inventoryCursor%FOUND loop
            fetch inventoryCursor into o_id,oL_quantity,inv_price;  
              dbms_output.put_line( o_id||'   '||inv_price*oL_quantity||'  '||disamt );  
            end loop;    
          close inventoryCursor;
              end;
     /

I got these errors
ORA-06550: line 33, column 23:
PLS-00103: Encountered the symbol "CAL_DIS" when expecting one of the following:

   if
ORA-06550: line 46, column 18:
PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following:

   end not pragma final instantiable order overriding static
   member constructor map1. declare
2.    cursor inventorycursor is
3.      select order_Line.o_id,order_Line.oL_quantity,inventory.inv_price
4.       from inventory
5.        join order_Line on order_Line.inv_id =inventory.inv_id;