Each month, 4000 barrels of crude 1, at $45 per barrel, and 7000 barrels of crude 2, at

$55 per barrel, can be purchased. All gas produced can be sold at the following per-barrel prices: gas 1,

$85; gas 2, $90; gas 3, $95. Determine how to maximize Sunco’s profit (revenues less costs). Assume that only 2500 hours of time on the catalytic cracker are available each month.