Volume Of A Sphere

The formula for compound interest compounded semi-annually is: where: - is the principal, - is the rate of interest, - years. First, calculate the amount : Now, compound interest is: Therefore, the correct answer is ₹ 3,780 (closest to the correct calculation).

The volume and surface area of a sphere are related to its radius by the following formulas: The ratio of the volumes of two spheres is given by: Since the ratio of the volumes is , we have: Now, the ratio of the surface areas is: Thus, the correct answer is .