Kindly answer a please and show how you got it

A hydroelectric power facility converts the gravitational potential energy of water behind a dam to electric energy. (For each answer, enter a number.) (a) What is the gravitational potential energy (in ]) relative to the generators of a lake of volume 56.0 km3 (mass = 5.60 x 1013 kg), given that the lake has an average height of 31.0 m above the generators? 1.701 X J (b) Compare this with the energy stored in a 9-megaton fusion bomb. Elake/Ebomb = 0.45 +