246  9

)  ,   

30%

20%

10%

-		r ^^^^>^
/^	^	
-'2-^		
'1/^		

10% 20% 30%

|)  ,  

30%

20%

10%

=4%

'3	/2	
		/^
^%		
.....^		

10% 20% 30%

. 9.8.        