Q11 of 118 Page 31

A furniture manufacturing company plans to make two products : chairs and tables. From its available resources which consists of 400 square feet of teak wood and 450 man hours. It is known that to make a chair requires 5 square feet of wood and 10 man - hours and yields a profit of ₹ 45, while each table uses 20 square feet of wood and 25 man - hours and yields a profit of ₹ 80. How many items of each product should be produced by the company so that the profit is maximum?

Let required production of chairs and tables be x and y respectively.


Since, profits of each chair and table is Rs. 45 and Rs. 80 respectively. So, profits on x number of type A and y number of type B are 45x and 80y respectively.


Let Z denotes total output daily, so,


Z = 45x + 80y


Since, each chair and table requires 5 sq. ft and 80 sq. ft of wood respectively. So, x number of chair and y number of table require 5x and 80y sq. ft of wood respectively. But,


But 400 sq. ft of wood is available. So,


5x + 80y 400


x + 4y 80 {First Constraint}


Since, each chair and table requires 10 and 25 men - hours respectively. So, x number of chair and y number of table require 10x and 25y men - hours respectively. But, only 450 hours are available . So,


10x + 25y 450


2x + 5y 90 {Second Constraint}


Hence mathematical formulation of the given LPP is,


Max Z = 45x + 80y


Subject to constraints,


x + 4y 80


2x + 5y 90


x,y 0 [Since production of chairs and tables can not be less than zero]


Region x + 4y 80: line x + 4y = 80 meets the axes at A(80,0), B(0,20) respectively.


Region containing the origin represents x + 4y 80 as origin satisfies x + 4y 80


Region 2x + 5y 90: line 2x + 5y = 90 meets the axes at C(45,0), D(0,20) respectively.


Region containing the origin represents 2x + 5y 90


as origin satisfies 2x + 5y 90


Region x,y 0: it represents the first quadrant.


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The corner points are O(0,0), D(0,18), C(45,0).


The values of Z at these corner points are as follows:



The maximum value of Z is 2025 which is attained at C(45,0).


Thus maximum profit of Rs 2025 is obtained when 45 units of chairs and no units of tables are produced.


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