Решение
Варианты расходов:
=
=
=
Ответ
320
![S[0] = `*`(400, .8)](im/m_322.gif){kind=small}
= ![S[0] = 320.0](im/m_323.gif){kind=small}
![S[200] = `+`(201, `*`(200, .7))](im/m_324.gif){kind=small}
= ![S[200] = 341.0](im/m_325.gif){kind=small}
![S[500] = 481](im/m_326.gif){kind=small}
= ![S[500] = 481](im/m_327.gif){kind=small}
Ответ = = = Ответ