:) :
, , ... , 28, :) ... 320 160 = 480
240 , :)
200 ( , ) , 4 10%-x
3 , ,
, 15 , , . 2,5-3 200 0% , 500-600, 2 , 5-6 4 10%- , 10-12 .
2,5 1/2-2/3 . 500 35% , 2-3
, 1-2 , . ( ), , , . ,
3 (, , 20, ), . , . .