The exchange rate between real currency (such as US dollars) and Robux, the virtual currency used in the online gaming platform Roblox, varies depending on the package you purchase and any ongoing promotions. As of my last update, the exchange rate for Robux packages typically ranges from around 80 Robux per US dollar to 100 Robux per US dollar.
Given this range, if we take the midpoint and assume an exchange rate of 90 Robux per US dollar, then $50 would be equivalent to:
$50 * 90 Robux/USD = 4500 Robux
However, it's essential to check the current exchange rates and any promotional offers directly on the Roblox platform, as they may vary over time.