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Please Solve RD Sharma Class 12 Chapter 17 Maxima and Minima Exercise Case Study Based Questions question 5 subquestion (ii)  Maths Textbook Solution.

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Hint:  perimeter of rectangle  \begin{aligned} &=2(l \times b) \\ & \end{aligned}


The cost of construction of the vertical wall is like Perimeter

Perimeter  \begin{aligned} &=2(l \times b) \\ & \end{aligned}


For one square meter the cost is 1800

Then the cost of a vertical wall is

\begin{aligned} &=2 \times 1800(\mathrm{x}+\mathrm{y}) \\ & \end{aligned}


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