Also find the volume of the figure below?

Ineed to learn how to solve this problem

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Five infinity stones cost $16.80. what is the price per infinity stone ?