Cost of construction for each flat = ₹993570 ...(0.25 marks)
Number of flats constructed = 350 ...(0.25 marks)
So we get, cost of construction of 350 flats = 993570 × 350 = ₹347749500 ...(0.25 marks)
Therefore, the total cost of construction of all the flats is ₹ 347749500.