Q. 39

Anil wants to invest at the most ₹12000 in bonds A and B. According to rules, he has to invest at least ₹2000 in bond A and at least ₹4000 in bond B. if the rate of interest of bond A is 8% per annum and on bond B, it is 10% per annum, how should he invest his money for maximum interest? Solve the problem graphically.

Answer :


Let the invested money in bond A be x and in bond B be y.


According to the question,


X + y , x , y


Maximize Z = 0.08x + 0.10y


The feasible region determined by X + y , x , yis given by



The corner points of the feasible region are A(2000,4000) , B(2000,10000) and C(8000,4000) . The value of Z at the corner point are



The maximum value of Z is 116770 at point (2000,10000)


So, he must invest Rs.2000 in bond A and Rs.10000 in bond B.


The maximum annual income is Rs.1160 .


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