Решение
Варианты расходов:
=
=
=
Ответ
150
![S[ ] = `*`(900, .2)](im/m_346.gif){kind=small}
= ![S[ ] = 180.0](im/m_347.gif){kind=small}
![S[] = `+`(140, `*`(.15, `*`(`+`(900, -320))))](im/m_348.gif){kind=small}
= ![S[] = 227.00](im/m_349.gif){kind=small}
![S[] = 150](im/m_350.gif){kind=small}
= ![S[] = 150](im/m_351.gif){kind=small}
Ответ = = = Ответ