Please Solve RD Sharma Class 12 Chapter 17 Maxima and Minima Exercise Case Study Based Questions question 5 subquestion (ii) Maths Textbook Solution.
                
                  Answer:
Hint:  perimeter of rectangle  
Solution:
The cost of construction of the vertical wall is like Perimeter
Perimeter  
               
For one square meter the cost is 1800
Then the cost of a vertical wall is