A uniform cube with mass $0\mathrm{.}500kg$ and volume $0\mathrm{.}0270m^3$ is sitting on the floor. A uniform sphere with radius $0\mathrm{.}400m$ and mass $0\mathrm{.}900kg$ sits on top of the cube.

Part A

How far is the center of mass of the two$-$object system above the floor?

Express your answer with the appropriate units.