If the rational numbers \(\frac{4}{-9}\) , \(\frac{7}{18}\) , \(\frac{5}{-6}\) , \(\frac{2}{3}\) are arranged in ascending order, which of the following will be placed first ?
Some cylindrical containers without a lid are to be made from a rectangular sheet of metal measuring 2.2m × 2.1m. The diameter and height of the containers to be made are the same. The cost of manufacturing a container is Rs. 50. If the diameter of the container is to be made 14 cm, then find the total cost (in Rs.) to make the complete container.