) = 
; , 
= 20 . .
) 20 + 10 = 30 (. .).
2
, , , : 7 + 3 = 10 (. .).
) :
7 + 3 100% /20 . = 50%
= 2000 .
= 10 120 = 1200 (. .)
) = 2000 1200 = 800 (.)
) г = 
6
100 . .
5. , . , . .
:
1. ) 20 + 10 = 30 (
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