$1-$ A person owns three fish plants across Newfoundland and Labrador through which he supplies fish to four stores.

We call the fish plants $1,2,$ and $3$ with production of $6,1,$ and $10$ tonnes per day, respectively. Likewise, we call stores

$1,2,3,$ and $4$ with demand of $7,5,3,$ and $2$ tonnes per day. The cost of delivery is given in the table below. Please

formulate a mathematical model for this problem.

From$\backslash$To $1234$

$123117$

$21061$

$358159$