Unit 1.4. Family farm model – step 1

Run GAMS and model the following problem. Then answer the questions (click on “Submit”) :  « A farmer owns 5 ha of land. His family can provide the equivalent of 5 people per year in terms of working time. The number of working days per year and per person is estimated at 100. This farmer can choose between 4 agricultural activities whose costs, yields and prices are shown in the table below. The currency is the rupee.
ACTIVITIES Wheat Rice Sugar cane Livestock
YIELD (Tons/ha or Rupees/ha for livestock)  9 6 18 17000
COSTS(Rupees/ha) 3120 5480 11360 5000
PRICE(Rupees/ton) 990 3276 1686 1
For livestock, the value shown in the yield row directly measures the gross product per hectare. A value of 1 was therefore provided in the price line. The table below compiles the resource needs for each activity.
ACTIVITIES Wheat Rice Sugar cane Livestock
Labour(days/year/ha) 40.5 96 282 159
The objective of the farmer is to maximize the global gross margin.» If you need help and/or to make sure you use the same names for the data : One you have modelled this problem, answer the questions.

What area dedicated to wheat will provide him with the highest gross margin ? Round off to a hundredth of a hectar

What area dedicated to rice will provide him with the highest gross margin ? Round off to a hundredth of a hectare.

What area dedicated to sugar cane will provide him with the highest gross margin ? Round off to a hundredth of a hectare.

What area dedicated to livestock will provide him with the highest gross margin ? Round off to a hundredth of a hectare.

How much income is made ? Round off to the nearest rupee.