The diameter of the base of a right circular cylinder is 98 cm and its height is 42 cm. Find the total surface area of the cylinder. \(\text{(Take } \pi = \frac{22}{7}\text{)}\)
The radius of a solid right circular cone is 36 cm and its height is 105 cm. The total surface area (in cm2) of the cone is \(\text{(use } \pi = \frac{22}{7}\text{)}\)
Find the gain percentage, given that Komal sold her scooter for ₹1,980 gaining \(\tfrac{1}{5}\)th of the selling price.