Min

s$.$t$.$

Consideration $1$

Consideration $2$

Consideration $3$

Consideration $4$

Consideration $5$

$($b$)$ Solve the model formulated in part $($a$).$

$(x_1,x_2,x_3,x_4,x_5,x_6,x_7,x_8,x_9,y)=()$

What is the optimal revenue $($in millions of dollars$)?$

million