Below is a picture of a fish tank from Ripley's Aquarium. It is made up of a longer cylindrical tank placed inside an open-topped, shorter and wider cylindrical tank. Assume that the longer tank can hold twice as much as the shorter tank and the total volume for both tanks is 9000 L. The glass used to create the bottom cylindrical tank has two pricing structures: the sides cost $4/cm and the bottom face costs $9/cm?.