Someone pls explain how to get the answer pls..​

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Plz hurry finals a paper cup in the shape of an inverted cone is 8 inches tall and has a radius of 1.5 inches. how much water can the cup hold? use 3.14 for pi. round the answer to the nearest tenth. a) 12.6 cubic in. b) 18.8 cubic in. c) 37.7 cubic in. d) 56.5 cubic in.

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25