How much is 99 cents in Robux?

Excuse me, as a cryptocurrency and finance professional, I have to admit that the conversion between traditional currencies and virtual currencies like Robux is not always straightforward. Could you elaborate on the context you're inquiring about? However, in a general sense, Robux is the virtual currency used in the Roblox platform, and its value is set by the platform itself. Therefore, the exact amount of Robux for 99 cents would depend on the current exchange rate set by Roblox. Could you please provide me with more information, such as the current exchange rate or the platform's official conversion tool, so that I can give you a more precise answer?