CBSE Class 12-science Answered
Suppose the dealer buys x fans and y sewing machines. Since the dealer has space for at most 20 items. Therefore,
A fan costs Rs. 360 and a sewing machine costs Rs. 240. Therefore, total cost of x fans and y sewing machine is Rs. (360 x + 240y). But the dealer has only Rs.5760 to invest.
Therefore,
Since the dealer can sell all the items that he can buy and the profit on a fan is Rs.22 and on a sewing machine the profit is of Rs. 18. Therefore, total profit on selling x fans and y sewing is of Rs. (22 x + 18 y).
Let Z denote the total profit. Then, Z = 22x + 18y.
Clearly, .
Thus, the mathematical formulation of the given problem is
Maximize
Subject to
and
To solve this LPP graphically, we first convert the inequations into equations and draw the corresponding lines. The feasible region of the LPP is shaded in Figure. The corner points of the feasible region OA2 PB1 are (0, 0), A2 (16, 0), P(8, 12) and B1 (0, 20).
These points have been obtained by solving the corresponding intersecting lines, simultaneously.
The values of the objective function Z at corner – points of the feasible region are given in the following table.
Point (x, y) |
Value of the objective function Z = 22 x+ 18y |
O(0 0) |
|
A2 (16, 0) |
|
P(8, 12) |
|
B1 (0, 20) |
|
Clearly, Z is maximum at x = 8 and y = 12. The maximum value of Z is 392.
Hence, the dealer should purchase 8 fans and 12 sewing machines to obtain the maximum profit under given conditions.