  
  
   50      
    50  250 (6   ).
   250  500  (6.5   ).
   500  1000 (7  ) .
   1000  5000  (7.5  ) .
    5000  10000  (8  ) .
    10000     3   .


---------------------------------


1 ***             +   +     100     6  1000      

2 ***         50        61000   

3 ***                +   +       50         50      6  1000          

***                            58       10    1000      0.05    5       0.75 