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 ₹55 per `m^2`

A path 1 m wide is built along th eborder and inside a square garden of side 30m. Find: the cost of planting grass in the remaining portion of the garden at the rate of Rs.40 per m^2 .

In a development plan of a city, a contractor has taken a contract to construct certain houses for which he needs building materials like stones, sand etc. There are three firms A, B, C that can supply him these materials. At one time these firms A, B, C supplied him 40, 35 and 25 truck loads of stones and 10, 5 and 8 truck load of sand respectively. If the cost of one truckload of stone and sand are Rs 1200 and 500 respectively, then find the total amount paid by the contractor to each of these firms A, B, C separately.