A rectangular corral with a total area of 60 square meters is to be fenced off and then divided into 2 rectangular sections by a fence down the middle. 
The fencing for the outside costs $9 per running meter, whereas that for the interior dividing fence costs $12 per running meter. Which of the following statements hold, if the cost (c) of the fencing is to be maximized?(I)The constraint equation is 3w + 2 l = 60 .(II)The objective equation is 2l ? w = 60 .(III)The constraint equation is w ? l = 60 .(IV)The objective equation is C = 30w + 18l .(V)The constraint equation is C = 12w + 9wl .(VI)The objective equation is C = 60 - lw .
A. V and VI
B. III and IV
C. I and II
D. none of these
Answer: B
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