Likewise, the maximum demand for each end product and the revenue generated per barrel are shown below.

Develop and solve a linear programming model $to$ maximize contribution $to$ profit.

Let $R_i=$ the number $of$ barrels $of$ input $ito$ use $to$ produce Regular, $i=1,2,3$

$S_i=$ the number $of$ barrels $of$ input $ito$ use $to$ produce Super, $i=1,2,3$

entered $in$ the box.

$R_1,R_2,R_3,S_1,S_2,S_{3}0$

What $is$ the optimal contribution $to$ profit?