. , 20 Rb=11,5 , Rbt=0,9 , b=27500 . A500 Rs=435 . 10 240. s=200000.
QB = 269,09 , .
, , :
QB = 339,53 .
lc=350 , , h=650. . : h0=h-a=650-50=600 .
Q : a= lc-lsup/2=350-290/2=205.
:
, ==205
QB = 339,53 < .
s.
, 1,25, :
=1,25Q×=1,25×339,53×0,205=87 ͷ.
: 2.
2Ø16 A500 S=402 2(+7,9%).