Afarmer plans to plant two crops, a and b. the cost of cultivating crop a is $40/acre whereas the cost of cultivating crop b is $60/acre. the farmer has a maximum of $7400 available for land cultivation. each acre of crop a requires 20 labor-hours, and each acre of crop b requires 25 labor-hours. the farmer has a maximum of 3300 labor-hours available. if she expects to make a profit of $170/acre on crop a and $210/acre on crop b, how many acres of each crop, x and y, respectively, should she plant in order to maximize her profit?

We will plant 165 of Crop A

Explanation:

We will compare the marginal contribution for each crop:  A   B

Profit:                170.00     210

cost of cultivating:  40.00       60

CM per constrain      4.25            3.50

Crop A is better regarding cultivating cost.

Now we analize the labor hours:

Profit:                      170     210

Labor hours per crop20       25

CM per constrain      8.50       8.40

Because Crop A is better at both constrain resource It will be better to plant only Crop A if possible. As assigning to Crop B will diminish the return on the scarce resourse.

We will see how much can we plant of Crop A

7400 / 40 = 185

3300 / 20 = 165

We will plant 165 of Crop A

which is the maximun we can plant at the given labor hours.

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