Assignment:

$($a$)$ Formulate Filatoi Riuniti's purchasing problem for the coming month $($March$)$:

Write down the formula for the objective function of your model.

Your model must have a capacity constraint for each local spinning mill. Write down the capacity constraints for the Ambrosi mill, for example.

Filatoi Riuniti must meet demand for each of the four sizes of yarn. Your model must have a constraint for the demand for each of the four sizes of yarn. Write down the constraint for the demand for extra fine yarn, for example.