4 Katerina bought a cylindrical tub of ice cream for her birthday party. The tub has a height of 9 inches and radius
of 5.5 inches. She also bought cylindrical cups to serve the ice cream in. Each cup has a height of 1.75 inches and a
radius of 2 inches. If Katerina fills each cup to the exact brim, how many cups of ice cream can she fill?