Mrs. Kaushik has a square plot with the measurement as shown in the figure. She wants to construct a house in the middle of the plot. A garden is developed around the house. Find the total cost of developing a garden around the house at the rate of Rs 55 per m².

∵  The given plot is a square with side as 25 m.
∴     Area of the plot = Side x Side
                                 = 25 m x 25 m = 625 m²
∵  The constructed portion is a rectangle having length = 20 m and breadth = 15 m.
∴     Area of the constructed portion = 20 m x 15 m
                                                          = 300 m²
                    Now area of the garden = [Total plot area] - [Total constructed area]
                                                           = (625 - 300)m²
                                                           = 325 m²
∴  Cost of developing the garden =  Rs 55 x 325
                                                     = Rs 17, 875