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1431  -2010 .

.

1- 30 :-


: :-

: 9 .
: 6 8 .
: .

: 20 :-

1_ :-

:                                                                                                 


:         9           6 8              6  
                                                                                                                              


         
:       270                 180                             90 

2- .
3- (20 ).

2- 10% .

:-

1- .

2- .

3- 30% .

4- 20 ( + ) .

5- ( ) :-

750 1250 .
4 ɡ 4 .

:-

: 4 ɡ 6

: 6 ɡ 8

( 750 ) ( 1250 ) .

( 1250 ) 5 543 500 1413 .

1431 .

( ) .

.