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 2.2 m × 2.1 m. 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.