Question


Bay Oil produces two types of fuels (regular and super) by mixing three ingredients. The major distinguishing feature of the two products is the octane level required. Regular fuel must have a minimum octane level of 90 while super must have a level of at least 100. The cost per barrel, octane levels, and available amounts (in barrels) for the upcoming two-week period are shown in the following table. Likewise, the maximum demand for each end product and the revenue generated per barrel are shown.

InputCost/BarrelOctaneAvailable (barrels)
116.5100110,000
21487350,000
317.5110300,000

Revenue/BarrelMax Demand (barrels)
Regular18.5350,000
Super20500,000

Develop and solve a linear programming model to maximize contribution to profitDevelop and solve a linear programming model to maximize contribution to profit. Let R = the number of barrels of input i to use to produce Regular, i = 1, 2, 3 Si = the number of barrels of input i to use to produce super, i = 1, 2, 3 If required, round your answers to one decimal place. For subtractive or negative numbers use a minus sign even if there is a sign before the blank. (Example: -300) Max R2 R3 s.t. 110000 R2 350000 300000 350000 500000 100 87 R2 110 R3 90 90 R2 90 R3 100 87 110 100 100 100 R1, R2, R3, S1, S2, S3 20 What is the optimal contribution to profit? Maximum Profit = $ 2845000 by making 260000 barrels of Regular and 500000 barrels of Super.


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Answer #1

we want to maximize revenue and minimize cost hence

we heve to maximize

18.5(R1+R2+R3) + 20(S1+S2+S3)-16.5(R1+S1)-14(R2 +S2)-17.5(R3+S3)

= 2 R1 +4.5 R2 + R3 + 3.5 S1 + 6 S2 + 2.5 S3

using all constraints

The way to realize the maximum profit is to buy 60140.03885bbl ingredient 1, 160683.9216bbl ingredient 2, 39176.03955 ingredi

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