Let x and y hectares of land be allocated to crop A and B respectively. If Z is the profit then
Z = 10500x + 9000y ......(i)
We have to maximize Z subject to the constraints:
x + y ≤ 50 ..........(ii)
20x + 10y ≤ 800 ⇒ 2x + y ≤ 80 …(iii)
x ≥ 0, y ≥ 0 ........(iv)
The graph of system of inequalities (ii) to (iv) are drawn, which gives feasible region OABC with corner points O (0, 0), A (40, 0), B (30, 20) and C (0, 50).
Table for x + y = 50
Table for 2x + y = 80
Feasible region is bounded.
Now,
Hence, the co-operative society of farmers will get the maximum profit of Rs 4,95,000 by allocating 30 hectares for crop A and 20 hectares for crop B.