So yeah... I think my calculator's busted. I need help with finding the volume of half a sphere?

So, the question is this: What volume of water will this Object displace? The picture I'm given is one half a sphere with a diameter of 100 cm and height of 50 cm. The answer I got is V=196349.5408. Now I know that's wrong because everyone else that I know got different answers from me. Please help!