Решение
Варианты расходов:
=
=
=
Ответ
480
![S[0] = `*`(600, .8)](im/m_328.gif){kind=small}
= ![S[0] = 480.0](im/m_329.gif){kind=small}
![S[400] = `+`(426, `*`(200, .6))](im/m_330.gif){kind=small}
= ![S[400] = 546.0](im/m_331.gif){kind=small}
![S[800] = 793](im/m_332.gif){kind=small}
= ![S[800] = 793](im/m_333.gif){kind=small}
Ответ = = = Ответ