$1.$ Do problem $13$ on pg$.849$ of the textbook.$$ First do the LP formulation of the problem i$.$e$.$ all the $4-$steps of the LP formulation $($give definition of variables, objective function, constraints, and non$-$negativity constraint.$$ What you type in LINGO is not complete formulation but a part of it$.).$ Then solve the problem using LINGO program.$$ Submit both the formulation $($all $4-$steps$)$ and computer printout solution.$$Highlight the optimal solution in the computer printout including the optimal value of the objective function.$($Hint: profit$=$revenue$-$cost$)$

$2.$ Do the LP case $($Son$,$ Ltd$.)$ on pg$.851$of the textbook. $$First do the LP formulation of the problem i$.$e$.$ all the $4-$steps of the LP formulation for just Question $1($no need to do questions $2$ and $3).$ Then solve the problem using LINGO program.$$ Submit both the formulation $($all $4-$steps$)$ and computer printout solution.$$Computer printout should include the highlighted optimal solution.